Version 1.73.0 (2023-10-05) ========================== Language -------- - [Uplift `clippy::fn_null_check` lint as `useless_ptr_null_checks`.](https://github.com/rust-lang/rust/pull/111717/) - [Make `noop_method_call` warn by default.](https://github.com/rust-lang/rust/pull/111916/) - [Support interpolated block for `try` and `async` in macros.](https://github.com/rust-lang/rust/pull/112953/) - [Make `unconditional_recursion` lint detect recursive drops.](https://github.com/rust-lang/rust/pull/113902/) - [Future compatibility warning for some impls being incorrectly considered not overlapping.](https://github.com/rust-lang/rust/pull/114023/) - [The `invalid_reference_casting` lint is now **deny-by-default** (instead of allow-by-default)](https://github.com/rust-lang/rust/pull/112431) Compiler -------- - [Write version information in a `.comment` section like GCC/Clang.](https://github.com/rust-lang/rust/pull/97550/) - [Add documentation on v0 symbol mangling.](https://github.com/rust-lang/rust/pull/97571/) - [Stabilize `extern "thiscall"` and `"thiscall-unwind"` ABIs.](https://github.com/rust-lang/rust/pull/114562/) - [Only check outlives goals on impl compared to trait.](https://github.com/rust-lang/rust/pull/109356/) - [Infer type in irrefutable slice patterns with fixed length as array.](https://github.com/rust-lang/rust/pull/113199/) - [Discard default auto trait impls if explicit ones exist.](https://github.com/rust-lang/rust/pull/113312/) - Add several new tier 3 targets: - [`aarch64-unknown-teeos`](https://github.com/rust-lang/rust/pull/113480/) - [`csky-unknown-linux-gnuabiv2`](https://github.com/rust-lang/rust/pull/113658/) - [`riscv64-linux-android`](https://github.com/rust-lang/rust/pull/112858/) - [`riscv64gc-unknown-hermit`](https://github.com/rust-lang/rust/pull/114004/) - [`x86_64-unikraft-linux-musl`](https://github.com/rust-lang/rust/pull/113411/) - [`x86_64-unknown-linux-ohos`](https://github.com/rust-lang/rust/pull/113061/) - [Add `wasm32-wasi-preview1-threads` as a tier 2 target.](https://github.com/rust-lang/rust/pull/112922/) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Add `Read`, `Write` and `Seek` impls for `Arc`.](https://github.com/rust-lang/rust/pull/94748/) - [Merge functionality of `io::Sink` into `io::Empty`.](https://github.com/rust-lang/rust/pull/98154/) - [Implement `RefUnwindSafe` for `Backtrace`](https://github.com/rust-lang/rust/pull/100455/) - [Make `ExitStatus` implement `Default`](https://github.com/rust-lang/rust/pull/106425/) - [`impl SliceIndex for (Bound, Bound)`](https://github.com/rust-lang/rust/pull/111081/) - [Change default panic handler message format.](https://github.com/rust-lang/rust/pull/112849/) - [Cleaner `assert_eq!` & `assert_ne!` panic messages.](https://github.com/rust-lang/rust/pull/111071/) - [Correct the (deprecated) Android `stat` struct definitions.](https://github.com/rust-lang/rust/pull/113130/) Stabilized APIs --------------- - [Unsigned `{integer}::div_ceil`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.div_ceil) - [Unsigned `{integer}::next_multiple_of`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.next_multiple_of) - [Unsigned `{integer}::checked_next_multiple_of`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.checked_next_multiple_of) - [`std::ffi::FromBytesUntilNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesUntilNulError.html) - [`std::os::unix::fs::chown`](https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chown.html) - [`std::os::unix::fs::fchown`](https://doc.rust-lang.org/stable/std/os/unix/fs/fn.fchown.html) - [`std::os::unix::fs::lchown`](https://doc.rust-lang.org/stable/std/os/unix/fs/fn.lchown.html) - [`LocalKey::>::get`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.get) - [`LocalKey::>::set`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.set) - [`LocalKey::>::take`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.take) - [`LocalKey::>::replace`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.replace) - [`LocalKey::>::with_borrow`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.with_borrow) - [`LocalKey::>::with_borrow_mut`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.with_borrow_mut) - [`LocalKey::>::set`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.set-1) - [`LocalKey::>::take`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.take-1) - [`LocalKey::>::replace`](https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.replace-1) These APIs are now stable in const contexts: - [`rc::Weak::new`](https://doc.rust-lang.org/stable/alloc/rc/struct.Weak.html#method.new) - [`sync::Weak::new`](https://doc.rust-lang.org/stable/alloc/sync/struct.Weak.html#method.new) - [`NonNull::as_ref`](https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.as_ref) Cargo ----- - [Encode URL params correctly for `SourceId` in `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/12280/) - [Bail out an error when using `cargo::` in custom build script.](https://github.com/rust-lang/cargo/pull/12332/) Misc ---- Compatibility Notes ------------------- - [Update the minimum external LLVM to 15.](https://github.com/rust-lang/rust/pull/114148/) - [Check for non-defining uses of return position `impl Trait`.](https://github.com/rust-lang/rust/pull/112842/) Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Remove LLVM pointee types, supporting only opaque pointers.](https://github.com/rust-lang/rust/pull/105545/) - [Port PGO/LTO/BOLT optimized build pipeline to Rust.](https://github.com/rust-lang/rust/pull/112235/) - [Replace in-tree `rustc_apfloat` with the new version of the crate.](https://github.com/rust-lang/rust/pull/113843/) - [Update to LLVM 17.](https://github.com/rust-lang/rust/pull/114048/) - [Add `internal_features` lint for internal unstable features.](https://github.com/rust-lang/rust/pull/108955/) - [Mention style for new syntax in tracking issue template.](https://github.com/rust-lang/rust/pull/113586/) Version 1.72.1 (2023-09-19) =========================== - [Adjust codegen change to improve LLVM codegen](https://github.com/rust-lang/rust/pull/115236) - [rustdoc: Fix self ty params in objects with lifetimes](https://github.com/rust-lang/rust/pull/115276) - [Fix regression in compile times](https://github.com/rust-lang/rust/pull/114948) - Resolve some ICE regressions in the compiler: - [#115215](https://github.com/rust-lang/rust/pull/115215) - [#115559](https://github.com/rust-lang/rust/pull/115559) Version 1.72.0 (2023-08-24) ========================== Language -------- - [Replace const eval limit by a lint and add an exponential backoff warning](https://github.com/rust-lang/rust/pull/103877/) - [expand: Change how `#![cfg(FALSE)]` behaves on crate root](https://github.com/rust-lang/rust/pull/110141/) - [Stabilize inline asm for LoongArch64](https://github.com/rust-lang/rust/pull/111235/) - [Uplift `clippy::undropped_manually_drops` lint](https://github.com/rust-lang/rust/pull/111530/) - [Uplift `clippy::invalid_utf8_in_unchecked` lint](https://github.com/rust-lang/rust/pull/111543/) as `invalid_from_utf8_unchecked` and `invalid_from_utf8` - [Uplift `clippy::cast_ref_to_mut` lint](https://github.com/rust-lang/rust/pull/111567/) as `invalid_reference_casting` - [Uplift `clippy::cmp_nan` lint](https://github.com/rust-lang/rust/pull/111818/) as `invalid_nan_comparisons` - [resolve: Remove artificial import ambiguity errors](https://github.com/rust-lang/rust/pull/112086/) - [Don't require associated types with Self: Sized bounds in `dyn Trait` objects](https://github.com/rust-lang/rust/pull/112319/) Compiler -------- - [Remember names of `cfg`-ed out items to mention them in diagnostics](https://github.com/rust-lang/rust/pull/109005/) - [Support for native WASM exceptions](https://github.com/rust-lang/rust/pull/111322/) - [Add support for NetBSD/aarch64-be (big-endian arm64).](https://github.com/rust-lang/rust/pull/111326/) - [Write to stdout if `-` is given as output file](https://github.com/rust-lang/rust/pull/111626/) - [Force all native libraries to be statically linked when linking a static binary](https://github.com/rust-lang/rust/pull/111698/) - [Add Tier 3 support for `loongarch64-unknown-none*`](https://github.com/rust-lang/rust/pull/112310/) - [Prevent `.eh_frame` from being emitted for `-C panic=abort`](https://github.com/rust-lang/rust/pull/112403/) - [Support 128-bit enum variant in debuginfo codegen](https://github.com/rust-lang/rust/pull/112474/) - [compiler: update solaris/illumos to enable tsan support.](https://github.com/rust-lang/rust/pull/112039/) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Document memory orderings of `thread::{park, unpark}`](https://github.com/rust-lang/rust/pull/99587/) - [io: soften ‘at most one write attempt’ requirement in io::Write::write](https://github.com/rust-lang/rust/pull/107200/) - [Specify behavior of HashSet::insert](https://github.com/rust-lang/rust/pull/107619/) - [Relax implicit `T: Sized` bounds on `BufReader`, `BufWriter` and `LineWriter`](https://github.com/rust-lang/rust/pull/111074/) - [Update runtime guarantee for `select_nth_unstable`](https://github.com/rust-lang/rust/pull/111974/) - [Return `Ok` on kill if process has already exited](https://github.com/rust-lang/rust/pull/112594/) - [Implement PartialOrd for `Vec`s over different allocators](https://github.com/rust-lang/rust/pull/112632/) - [Use 128 bits for TypeId hash](https://github.com/rust-lang/rust/pull/109953/) - [Don't drain-on-drop in DrainFilter impls of various collections.](https://github.com/rust-lang/rust/pull/104455/) - [Make `{Arc,Rc,Weak}::ptr_eq` ignore pointer metadata](https://github.com/rust-lang/rust/pull/106450/) Rustdoc ------- - [Allow whitespace as path separator like double colon](https://github.com/rust-lang/rust/pull/108537/) - [Add search result item types after their name](https://github.com/rust-lang/rust/pull/110688/) - [Search for slices and arrays by type with `[]`](https://github.com/rust-lang/rust/pull/111958/) - [Clean up type unification and "unboxing"](https://github.com/rust-lang/rust/pull/112233/) Stabilized APIs --------------- - [`impl Sync for mpsc::Sender`](https://doc.rust-lang.org/stable/std/sync/mpsc/struct.Sender.html#impl-Sync-for-Sender%3CT%3E) - [`impl TryFrom<&OsStr> for &str`](https://doc.rust-lang.org/stable/std/primitive.str.html#impl-TryFrom%3C%26'a+OsStr%3E-for-%26'a+str) - [`String::leak`](https://doc.rust-lang.org/stable/alloc/string/struct.String.html#method.leak) These APIs are now stable in const contexts: - [`CStr::from_bytes_with_nul`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul) - [`CStr::to_bytes`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.to_bytes) - [`CStr::to_bytes_with_nul`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.to_bytes_with_nul) - [`CStr::to_str`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.to_str) Cargo ----- - Enable `-Zdoctest-in-workspace` by default. When running each documentation test, the working directory is set to the root directory of the package the test belongs to. [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-test.html#working-directory-of-tests) [#12221](https://github.com/rust-lang/cargo/pull/12221) [#12288](https://github.com/rust-lang/cargo/pull/12288) - Add support of the "default" keyword to reset previously set `build.jobs` parallelism back to the default. [#12222](https://github.com/rust-lang/cargo/pull/12222) Compatibility Notes ------------------- - [Alter `Display` for `Ipv6Addr` for IPv4-compatible addresses](https://github.com/rust-lang/rust/pull/112606/) - Cargo changed feature name validation check to a hard error. The warning was added in Rust 1.49. These extended characters aren't allowed on crates.io, so this should only impact users of other registries, or people who don't publish to a registry. [#12291](https://github.com/rust-lang/cargo/pull/12291) - [Demoted `mips*-unknown-linux-gnu*` targets from host tier 2 to target tier 3 support.](https://github.com/rust-lang/rust/pull/113274) Version 1.71.1 (2023-08-03) =========================== - [Fix CVE-2023-38497: Cargo did not respect the umask when extracting dependencies](https://github.com/rust-lang/cargo/security/advisories/GHSA-j3xp-wfr4-hx87) - [Fix bash completion for users of Rustup](https://github.com/rust-lang/rust/pull/113579) - [Do not show `suspicious_double_ref_op` lint when calling `borrow()`](https://github.com/rust-lang/rust/pull/112517) - [Fix ICE: substitute types before checking inlining compatibility](https://github.com/rust-lang/rust/pull/113802) - [Fix ICE: don't use `can_eq` in `derive(..)` suggestion for missing method](https://github.com/rust-lang/rust/pull/111516) - [Fix building Rust 1.71.0 from the source tarball](https://github.com/rust-lang/rust/issues/113678) Version 1.71.0 (2023-07-13) ========================== Language -------- - [Stabilize `raw-dylib`, `link_ordinal`, `import_name_type` and `-Cdlltool`.](https://github.com/rust-lang/rust/pull/109677/) - [Uplift `clippy::{drop,forget}_{ref,copy}` lints.](https://github.com/rust-lang/rust/pull/109732/) - [Type inference is more conservative around constrained vars.](https://github.com/rust-lang/rust/pull/110100/) - [Use fulfillment to check `Drop` impl compatibility](https://github.com/rust-lang/rust/pull/110577/) Compiler -------- - [Evaluate place expression in `PlaceMention`](https://github.com/rust-lang/rust/pull/104844/), making `let _ =` patterns more consistent with respect to the borrow checker. - [Add `--print deployment-target` flag for Apple targets.](https://github.com/rust-lang/rust/pull/105354/) - [Stabilize `extern "C-unwind"` and friends.](https://github.com/rust-lang/rust/pull/106075/) The existing `extern "C"` etc. may change behavior for cross-language unwinding in a future release. - [Update the version of musl used on `*-linux-musl` targets to 1.2.3](https://github.com/rust-lang/rust/pull/107129/), enabling [time64](https://musl.libc.org/time64.html) on 32-bit systems. - [Stabilize `debugger_visualizer`](https://github.com/rust-lang/rust/pull/108668/) for embedding metadata like Microsoft's Natvis. - [Enable flatten-format-args by default.](https://github.com/rust-lang/rust/pull/109999/) - [Make `Self` respect tuple constructor privacy.](https://github.com/rust-lang/rust/pull/111245/) - [Improve niche placement by trying two strategies and picking the better result.](https://github.com/rust-lang/rust/pull/108106/) - [Use `apple-m1` as the target CPU for `aarch64-apple-darwin`.](https://github.com/rust-lang/rust/pull/109899/) - [Add Tier 3 support for the `x86_64h-apple-darwin` target.](https://github.com/rust-lang/rust/pull/108795/) - [Promote `loongarch64-unknown-linux-gnu` to Tier 2 with host tools.](https://github.com/rust-lang/rust/pull/110936/) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Rework handling of recursive panics.](https://github.com/rust-lang/rust/pull/110975/) Additional panics are allowed while unwinding, as long as they are caught before escaping a `Drop` implementation, but panicking within a panic hook is now an immediate abort. - [Loosen `From<&[T]> for Box<[T]>` bound to `T: Clone`.](https://github.com/rust-lang/rust/pull/103406/) - [Remove unnecessary `T: Send` bound](https://github.com/rust-lang/rust/pull/111134/) in `Error for mpsc::SendError` and `TrySendError`. - [Fix docs for `alloc::realloc`](https://github.com/rust-lang/rust/pull/108630/) to match `Layout` requirements that the size must not exceed `isize::MAX`. - [Document `const {}` syntax for `std::thread_local`.](https://github.com/rust-lang/rust/pull/110620/) This syntax was stabilized in Rust 1.59, but not previously mentioned in release notes. Stabilized APIs --------------- - [`CStr::is_empty`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.is_empty) - [`BuildHasher::hash_one`](https://doc.rust-lang.org/stable/std/hash/trait.BuildHasher.html#method.hash_one) - [`NonZeroI*::is_positive`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.is_positive) - [`NonZeroI*::is_negative`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.is_negative) - [`NonZeroI*::checked_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.checked_neg) - [`NonZeroI*::overflowing_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.overflowing_neg) - [`NonZeroI*::saturating_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.saturating_neg) - [`NonZeroI*::wrapping_neg`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#method.wrapping_neg) - [`Neg for NonZeroI*`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#impl-Neg-for-NonZeroI32) - [`Neg for &NonZeroI*`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI32.html#impl-Neg-for-%26NonZeroI32) - [`From<[T; N]> for (T...)`](https://doc.rust-lang.org/stable/std/primitive.array.html#impl-From%3C%5BT;+1%5D%3E-for-(T,)) (array to N-tuple for N in 1..=12) - [`From<(T...)> for [T; N]`](https://doc.rust-lang.org/stable/std/primitive.array.html#impl-From%3C(T,)%3E-for-%5BT;+1%5D) (N-tuple to array for N in 1..=12) - [`windows::io::AsHandle for Box`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html#impl-AsHandle-for-Box%3CT%3E) - [`windows::io::AsHandle for Rc`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html#impl-AsHandle-for-Rc%3CT%3E) - [`windows::io::AsHandle for Arc`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html#impl-AsHandle-for-Arc%3CT%3E) - [`windows::io::AsSocket for Box`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html#impl-AsSocket-for-Box%3CT%3E) - [`windows::io::AsSocket for Rc`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html#impl-AsSocket-for-Rc%3CT%3E) - [`windows::io::AsSocket for Arc`](https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html#impl-AsSocket-for-Arc%3CT%3E) These APIs are now stable in const contexts: - [`<*const T>::read`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read) - [`<*const T>::read_unaligned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read_unaligned) - [`<*mut T>::read`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read-1) - [`<*mut T>::read_unaligned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.read_unaligned-1) - [`ptr::read`](https://doc.rust-lang.org/stable/std/ptr/fn.read.html) - [`ptr::read_unaligned`](https://doc.rust-lang.org/stable/std/ptr/fn.read_unaligned.html) - [`<[T]>::split_at`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_at) Cargo ----- - [Allow named debuginfo options in `Cargo.toml`.](https://github.com/rust-lang/cargo/pull/11958/) - [Add `workspace_default_members` to the output of `cargo metadata`.](https://github.com/rust-lang/cargo/pull/11978/) - [Automatically inherit workspace fields when running `cargo new`/`cargo init`.](https://github.com/rust-lang/cargo/pull/12069/) Rustdoc ------- - [Add a new `rustdoc::unescaped_backticks` lint for broken inline code.](https://github.com/rust-lang/rust/pull/105848/) - [Support strikethrough with single tildes.](https://github.com/rust-lang/rust/pull/111152/) (`~~old~~` vs. `~new~`) Misc ---- Compatibility Notes ------------------- - [Remove structural match from `TypeId`.](https://github.com/rust-lang/rust/pull/103291/) Code that uses a constant `TypeId` in a pattern will potentially be broken. Known cases have already been fixed -- in particular, users of the `log` crate's `kv_unstable` feature should update to `log v0.4.18` or later. - [Add a `sysroot` crate to represent the standard library crates.](https://github.com/rust-lang/rust/pull/108865/) This does not affect stable users, but may require adjustment in tools that build their own standard library. - [Cargo optimizes its usage under `rustup`.](https://github.com/rust-lang/cargo/pull/11917/) When Cargo detects it will run `rustc` pointing to a rustup proxy, it'll try bypassing the proxy and use the underlying binary directly. There are assumptions around the interaction with rustup and `RUSTUP_TOOLCHAIN`. However, it's not expected to affect normal users. - [When querying a package, Cargo tries only the original name, all hyphens, and all underscores to handle misspellings.](https://github.com/rust-lang/cargo/pull/12083/) Previously, Cargo tried each combination of hyphens and underscores, causing excessive requests to crates.io. - Cargo now [disallows `RUSTUP_HOME`](https://github.com/rust-lang/cargo/pull/12101/) and [`RUSTUP_TOOLCHAIN`](https://github.com/rust-lang/cargo/pull/12107/) in the `[env]` configuration table. This is considered to be not a use case Cargo would like to support, since it will likely cause problems or lead to confusion. Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. Version 1.70.0 (2023-06-01) ========================== Language -------- - [Relax ordering rules for `asm!` operands](https://github.com/rust-lang/rust/pull/105798/) - [Properly allow macro expanded `format_args` invocations to uses captures](https://github.com/rust-lang/rust/pull/106505/) - [Lint ambiguous glob re-exports](https://github.com/rust-lang/rust/pull/107880/) - [Perform const and unsafe checking for expressions in `let _ = expr` position.](https://github.com/rust-lang/rust/pull/102256/) Compiler -------- - [Extend -Cdebuginfo with new options and named aliases](https://github.com/rust-lang/rust/pull/109808/) This provides a smaller version of debuginfo for cases that only need line number information (`-Cdebuginfo=line-tables-only`), which may eventually become the default for `-Cdebuginfo=1`. - [Make `unused_allocation` lint against `Box::new` too](https://github.com/rust-lang/rust/pull/104363/) - [Detect uninhabited types early in const eval](https://github.com/rust-lang/rust/pull/109435/) - [Switch to LLD as default linker for {arm,thumb}v4t-none-eabi](https://github.com/rust-lang/rust/pull/109721/) - [Add tier 3 target `loongarch64-unknown-linux-gnu`](https://github.com/rust-lang/rust/pull/96971) - [Add tier 3 target for `i586-pc-nto-qnx700` (QNX Neutrino RTOS, version 7.0)](https://github.com/rust-lang/rust/pull/109173/), - [Insert alignment checks for pointer dereferences as debug assertions](https://github.com/rust-lang/rust/pull/98112) This catches undefined behavior at runtime, and may cause existing code to fail. Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Document NonZeroXxx layout guarantees](https://github.com/rust-lang/rust/pull/94786/) - [Windows: make `Command` prefer non-verbatim paths](https://github.com/rust-lang/rust/pull/96391/) - [Implement Default for some alloc/core iterators](https://github.com/rust-lang/rust/pull/99929/) - [Fix handling of trailing bare CR in str::lines](https://github.com/rust-lang/rust/pull/100311/) - [allow negative numeric literals in `concat!`](https://github.com/rust-lang/rust/pull/106844/) - [Add documentation about the memory layout of `Cell`](https://github.com/rust-lang/rust/pull/106921/) - [Use `partial_cmp` to implement tuple `lt`/`le`/`ge`/`gt`](https://github.com/rust-lang/rust/pull/108157/) - [Stabilize `atomic_as_ptr`](https://github.com/rust-lang/rust/pull/108419/) - [Stabilize `nonnull_slice_from_raw_parts`](https://github.com/rust-lang/rust/pull/97506/) - [Partial stabilization of `once_cell`](https://github.com/rust-lang/rust/pull/105587/) - [Stabilize `nonzero_min_max`](https://github.com/rust-lang/rust/pull/106633/) - [Flatten/inline format_args!() and (string and int) literal arguments into format_args!()](https://github.com/rust-lang/rust/pull/106824/) - [Stabilize movbe target feature](https://github.com/rust-lang/rust/pull/107711/) - [don't splice from files into pipes in io::copy](https://github.com/rust-lang/rust/pull/108283/) - [Add a builtin unstable `FnPtr` trait that is implemented for all function pointers](https://github.com/rust-lang/rust/pull/108080/) This extends `Debug`, `Pointer`, `Hash`, `PartialEq`, `Eq`, `PartialOrd`, and `Ord` implementations for function pointers with all ABIs. Stabilized APIs --------------- - [`NonZero*::MIN/MAX`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroI8.html#associatedconstant.MIN) - [`BinaryHeap::retain`](https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.retain) - [`Default for std::collections::binary_heap::IntoIter`](https://doc.rust-lang.org/stable/std/collections/binary_heap/struct.IntoIter.html) - [`Default for std::collections::btree_map::{IntoIter, Iter, IterMut}`](https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoIter.html) - [`Default for std::collections::btree_map::{IntoKeys, Keys}`](https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoKeys.html) - [`Default for std::collections::btree_map::{IntoValues, Values}`](https://doc.rust-lang.org/stable/std/collections/btree_map/struct.IntoValues.html) - [`Default for std::collections::btree_map::Range`](https://doc.rust-lang.org/stable/std/collections/btree_map/struct.Range.html) - [`Default for std::collections::btree_set::{IntoIter, Iter}`](https://doc.rust-lang.org/stable/std/collections/btree_set/struct.IntoIter.html) - [`Default for std::collections::btree_set::Range`](https://doc.rust-lang.org/stable/std/collections/btree_set/struct.Range.html) - [`Default for std::collections::linked_list::{IntoIter, Iter, IterMut}`](https://doc.rust-lang.org/stable/alloc/collections/linked_list/struct.IntoIter.html) - [`Default for std::vec::IntoIter`](https://doc.rust-lang.org/stable/alloc/vec/struct.IntoIter.html#impl-Default-for-IntoIter%3CT,+A%3E) - [`Default for std::iter::Chain`](https://doc.rust-lang.org/stable/std/iter/struct.Chain.html) - [`Default for std::iter::Cloned`](https://doc.rust-lang.org/stable/std/iter/struct.Cloned.html) - [`Default for std::iter::Copied`](https://doc.rust-lang.org/stable/std/iter/struct.Copied.html) - [`Default for std::iter::Enumerate`](https://doc.rust-lang.org/stable/std/iter/struct.Enumerate.html) - [`Default for std::iter::Flatten`](https://doc.rust-lang.org/stable/std/iter/struct.Flatten.html) - [`Default for std::iter::Fuse`](https://doc.rust-lang.org/stable/std/iter/struct.Fuse.html) - [`Default for std::iter::Rev`](https://doc.rust-lang.org/stable/std/iter/struct.Rev.html) - [`Default for std::slice::Iter`](https://doc.rust-lang.org/stable/std/slice/struct.Iter.html) - [`Default for std::slice::IterMut`](https://doc.rust-lang.org/stable/std/slice/struct.IterMut.html) - [`Rc::into_inner`](https://doc.rust-lang.org/stable/alloc/rc/struct.Rc.html#method.into_inner) - [`Arc::into_inner`](https://doc.rust-lang.org/stable/alloc/sync/struct.Arc.html#method.into_inner) - [`std::cell::OnceCell`](https://doc.rust-lang.org/stable/std/cell/struct.OnceCell.html) - [`Option::is_some_and`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.is_some_and) - [`NonNull::slice_from_raw_parts`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.slice_from_raw_parts) - [`Result::is_ok_and`](https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.is_ok_and) - [`Result::is_err_and`](https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.is_err_and) - [`std::sync::atomic::Atomic*::as_ptr`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicU8.html#method.as_ptr) - [`std::io::IsTerminal`](https://doc.rust-lang.org/stable/std/io/trait.IsTerminal.html) - [`std::os::linux::net::SocketAddrExt`](https://doc.rust-lang.org/stable/std/os/linux/net/trait.SocketAddrExt.html) - [`std::os::unix::net::UnixDatagram::bind_addr`](https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.bind_addr) - [`std::os::unix::net::UnixDatagram::connect_addr`](https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.connect_addr) - [`std::os::unix::net::UnixDatagram::send_to_addr`](https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixDatagram.html#method.send_to_addr) - [`std::os::unix::net::UnixListener::bind_addr`](https://doc.rust-lang.org/stable/std/os/unix/net/struct.UnixListener.html#method.bind_addr) - [`std::path::Path::as_mut_os_str`](https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.as_mut_os_str) - [`std::sync::OnceLock`](https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html) Cargo ----- - [Add `CARGO_PKG_README`](https://github.com/rust-lang/cargo/pull/11645/) - [Make `sparse` the default protocol for crates.io](https://github.com/rust-lang/cargo/pull/11791/) - [Accurately show status when downgrading dependencies](https://github.com/rust-lang/cargo/pull/11839/) - [Use registry.default for login/logout](https://github.com/rust-lang/cargo/pull/11949/) - [Stabilize `cargo logout`](https://github.com/rust-lang/cargo/pull/11950/) Misc ---- - [Stabilize rustdoc `--test-run-directory`](https://github.com/rust-lang/rust/pull/103682/) Compatibility Notes ------------------- - [Prevent stable `libtest` from supporting `-Zunstable-options`](https://github.com/rust-lang/rust/pull/109044/) - [Perform const and unsafe checking for expressions in `let _ = expr` position.](https://github.com/rust-lang/rust/pull/102256/) - [WebAssembly targets enable `sign-ext` and `mutable-globals` features in codegen](https://github.com/rust-lang/rust/issues/109807) This may cause incompatibility with older execution environments. - [Insert alignment checks for pointer dereferences as debug assertions](https://github.com/rust-lang/rust/pull/98112) This catches undefined behavior at runtime, and may cause existing code to fail. Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Upgrade to LLVM 16](https://github.com/rust-lang/rust/pull/109474/) - [Use SipHash-1-3 instead of SipHash-2-4 for StableHasher](https://github.com/rust-lang/rust/pull/107925/) Version 1.69.0 (2023-04-20) ========================== Language -------- - [Deriving built-in traits on packed structs works with `Copy` fields.](https://github.com/rust-lang/rust/pull/104429/) - [Stabilize the `cmpxchg16b` target feature on x86 and x86_64.](https://github.com/rust-lang/rust/pull/106774/) - [Improve analysis of trait bounds for associated types.](https://github.com/rust-lang/rust/pull/103695/) - [Allow associated types to be used as union fields.](https://github.com/rust-lang/rust/pull/106938/) - [Allow `Self: Autotrait` bounds on dyn-safe trait methods.](https://github.com/rust-lang/rust/pull/107082/) - [Treat `str` as containing `[u8]` for auto trait purposes.](https://github.com/rust-lang/rust/pull/107941/) Compiler -------- - [Upgrade `*-pc-windows-gnu` on CI to mingw-w64 v10 and GCC 12.2.](https://github.com/rust-lang/rust/pull/100178/) - [Rework min_choice algorithm of member constraints.](https://github.com/rust-lang/rust/pull/105300/) - [Support `true` and `false` as boolean flags in compiler arguments.](https://github.com/rust-lang/rust/pull/107043/) - [Default `repr(C)` enums to `c_int` size.](https://github.com/rust-lang/rust/pull/107592/) Libraries --------- - [Implement the unstable `DispatchFromDyn` for cell types, allowing downstream experimentation with custom method receivers.](https://github.com/rust-lang/rust/pull/97373/) - [Document that `fmt::Arguments::as_str()` may return `Some(_)` in more cases after optimization, subject to change.](https://github.com/rust-lang/rust/pull/106823/) - [Implement `AsFd` and `AsRawFd` for `Rc`.](https://github.com/rust-lang/rust/pull/107317/) Stabilized APIs --------------- - [`CStr::from_bytes_until_nul`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html#method.from_bytes_until_nul) - [`core::ffi::FromBytesUntilNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesUntilNulError.html) These APIs are now stable in const contexts: - [`SocketAddr::new`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.new) - [`SocketAddr::ip`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.ip) - [`SocketAddr::port`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.port) - [`SocketAddr::is_ipv4`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.is_ipv4) - [`SocketAddr::is_ipv6`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.is_ipv6) - [`SocketAddrV4::new`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.new) - [`SocketAddrV4::ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.ip) - [`SocketAddrV4::port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.port) - [`SocketAddrV6::new`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.new) - [`SocketAddrV6::ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.ip) - [`SocketAddrV6::port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.port) - [`SocketAddrV6::flowinfo`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.flowinfo) - [`SocketAddrV6::scope_id`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.scope_id) Cargo ----- - [Cargo now suggests `cargo fix` or `cargo clippy --fix` when compilation warnings are auto-fixable.](https://github.com/rust-lang/cargo/pull/11558/) - [Cargo now suggests `cargo add` if you try to install a library crate.](https://github.com/rust-lang/cargo/pull/11410/) - [Cargo now sets the `CARGO_BIN_NAME` environment variable also for binary examples.](https://github.com/rust-lang/cargo/pull/11705/) Rustdoc ----- - [Vertically compact trait bound formatting.](https://github.com/rust-lang/rust/pull/102842/) - [Only include stable lints in `rustdoc::all` group.](https://github.com/rust-lang/rust/pull/106316/) - [Compute maximum Levenshtein distance based on the query.](https://github.com/rust-lang/rust/pull/107141/) - [Remove inconsistently-present sidebar tooltips.](https://github.com/rust-lang/rust/pull/107490/) - [Search by macro when query ends with `!`.](https://github.com/rust-lang/rust/pull/108143/) Compatibility Notes ------------------- - [The `rust-analysis` component from `rustup` now only contains a warning placeholder.](https://github.com/rust-lang/rust/pull/101841/) This was primarily intended for RLS, and the corresponding `-Zsave-analysis` flag has been removed from the compiler as well. - [Unaligned references to packed fields are now a hard error.](https://github.com/rust-lang/rust/pull/102513/) This has been a warning since 1.53, and denied by default with a future-compatibility warning since 1.62. - [Update the minimum external LLVM to 14.](https://github.com/rust-lang/rust/pull/107573/) - [Cargo now emits errors on invalid characters in a registry token.](https://github.com/rust-lang/cargo/pull/11600/) - [When `default-features` is set to false of a workspace dependency, and an inherited dependency of a member has `default-features = true`, Cargo will enable default features of that dependency.](https://github.com/rust-lang/cargo/pull/11409/) - [Cargo denies `CARGO_HOME` in the `[env]` configuration table. Cargo itself doesn't pick up this value, but recursive calls to cargo would, which was not intended.](https://github.com/rust-lang/cargo/pull/11644/) - [Debuginfo for build dependencies is now off if not explicitly set. This is expected to improve the overall build time.](https://github.com/rust-lang/cargo/pull/11252/) - [The Rust distribution no longer always includes rustdoc](https://github.com/rust-lang/rust/pull/106886) If `tools = [...]` is set in config.toml, we will respect a missing rustdoc in that list. By default rustdoc remains included. To retain the prior behavior explicitly add `"rustdoc"` to the list. Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Move `format_args!()` into AST (and expand it during AST lowering)](https://github.com/rust-lang/rust/pull/106745/) Version 1.68.2 (2023-03-28) =========================== - [Update the GitHub RSA host key bundled within Cargo](https://github.com/rust-lang/cargo/pull/11883). The key was [rotated by GitHub](https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/) on 2023-03-24 after the old one leaked. - [Mark the old GitHub RSA host key as revoked](https://github.com/rust-lang/cargo/pull/11889). This will prevent Cargo from accepting the leaked key even when trusted by the system. - [Add support for `@revoked` and a better error message for `@cert-authority` in Cargo's SSH host key verification](https://github.com/rust-lang/cargo/pull/11635) Version 1.68.1 (2023-03-23) =========================== - [Fix miscompilation in produced Windows MSVC artifacts](https://github.com/rust-lang/rust/pull/109094) This was introduced by enabling ThinLTO for the distributed rustc which led to miscompilations in the resulting binary. Currently this is believed to be limited to the -Zdylib-lto flag used for rustc compilation, rather than a general bug in ThinLTO, so only rustc artifacts should be affected. - [Fix --enable-local-rust builds](https://github.com/rust-lang/rust/pull/109111/) - [Treat `$prefix-clang` as `clang` in linker detection code](https://github.com/rust-lang/rust/pull/109156) - [Fix panic in compiler code](https://github.com/rust-lang/rust/pull/108162) Version 1.68.0 (2023-03-09) ========================== Language -------- - [Stabilize default_alloc_error_handler](https://github.com/rust-lang/rust/pull/102318/) This allows usage of `alloc` on stable without requiring the definition of a handler for allocation failure. Defining custom handlers is still unstable. - [Stabilize `efiapi` calling convention.](https://github.com/rust-lang/rust/pull/105795/) - [Remove implicit promotion for types with drop glue](https://github.com/rust-lang/rust/pull/105085/) Compiler -------- - [Change `bindings_with_variant_name` to deny-by-default](https://github.com/rust-lang/rust/pull/104154/) - [Allow .. to be parsed as let initializer](https://github.com/rust-lang/rust/pull/105701/) - [Add `armv7-sony-vita-newlibeabihf` as a tier 3 target](https://github.com/rust-lang/rust/pull/105712/) - [Always check alignment during compile-time const evaluation](https://github.com/rust-lang/rust/pull/104616/) - [Disable "split dwarf inlining" by default.](https://github.com/rust-lang/rust/pull/106709/) - [Add vendor to Fuchsia's target triple](https://github.com/rust-lang/rust/pull/106429/) - [Enable sanitizers for s390x-linux](https://github.com/rust-lang/rust/pull/107127/) Libraries --------- - [Loosen the bound on the Debug implementation of Weak.](https://github.com/rust-lang/rust/pull/90291/) - [Make `std::task::Context` !Send and !Sync](https://github.com/rust-lang/rust/pull/95985/) - [PhantomData layout guarantees](https://github.com/rust-lang/rust/pull/104081/) - [Don't derive Debug for `OnceWith` & `RepeatWith`](https://github.com/rust-lang/rust/pull/104163/) - [Implement DerefMut for PathBuf](https://github.com/rust-lang/rust/pull/105018/) - [Add O(1) `Vec -> VecDeque` conversion guarantee](https://github.com/rust-lang/rust/pull/105128/) - [Leak amplification for peek_mut() to ensure BinaryHeap's invariant is always met](https://github.com/rust-lang/rust/pull/105851/) Stabilized APIs --------------- - [`{core,std}::pin::pin!`](https://doc.rust-lang.org/stable/std/pin/macro.pin.html) - [`impl From for {f32,f64}`](https://doc.rust-lang.org/stable/std/primitive.f32.html#impl-From%3Cbool%3E-for-f32) - [`std::path::MAIN_SEPARATOR_STR`](https://doc.rust-lang.org/stable/std/path/constant.MAIN_SEPARATOR_STR.html) - [`impl DerefMut for PathBuf`](https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#impl-DerefMut-for-PathBuf) These APIs are now stable in const contexts: - [`VecDeque::new`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.new) Cargo ----- - [Stabilize sparse registry support for crates.io](https://github.com/rust-lang/cargo/pull/11224/) - [`cargo build --verbose` tells you more about why it recompiles.](https://github.com/rust-lang/cargo/pull/11407/) - [Show progress of crates.io index update even `net.git-fetch-with-cli` option enabled](https://github.com/rust-lang/cargo/pull/11579/) Misc ---- Compatibility Notes ------------------- - [Only support Android NDK 25 or newer](https://blog.rust-lang.org/2023/01/09/android-ndk-update-r25.html) - [Add `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` to future-incompat report](https://github.com/rust-lang/rust/pull/103418/) - [Only specify `--target` by default for `-Zgcc-ld=lld` on wasm](https://github.com/rust-lang/rust/pull/101792/) - [Bump `IMPLIED_BOUNDS_ENTAILMENT` to Deny + ReportNow](https://github.com/rust-lang/rust/pull/106465/) - [`std::task::Context` no longer implements Send and Sync](https://github.com/rust-lang/rust/pull/95985) Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Encode spans relative to the enclosing item](https://github.com/rust-lang/rust/pull/84762/) - [Don't normalize in AstConv](https://github.com/rust-lang/rust/pull/101947/) - [Find the right lower bound region in the scenario of partial order relations](https://github.com/rust-lang/rust/pull/104765/) - [Fix impl block in const expr](https://github.com/rust-lang/rust/pull/104889/) - [Check ADT fields for copy implementations considering regions](https://github.com/rust-lang/rust/pull/105102/) - [rustdoc: simplify JS search routine by not messing with lev distance](https://github.com/rust-lang/rust/pull/105796/) - [Enable ThinLTO for rustc on `x86_64-pc-windows-msvc`](https://github.com/rust-lang/rust/pull/103591/) - [Enable ThinLTO for rustc on `x86_64-apple-darwin`](https://github.com/rust-lang/rust/pull/103647/) Version 1.67.1 (2023-02-09) =========================== - [Fix interoperability with thin archives.](https://github.com/rust-lang/rust/pull/107360) - [Fix an internal error in the compiler build process.](https://github.com/rust-lang/rust/pull/105624) - [Downgrade `clippy::uninlined_format_args` to pedantic.](https://github.com/rust-lang/rust-clippy/pull/10265) Version 1.67.0 (2023-01-26) ========================== Language -------- - [Make `Sized` predicates coinductive, allowing cycles.](https://github.com/rust-lang/rust/pull/100386/) - [`#[must_use]` annotations on `async fn` also affect the `Future::Output`.](https://github.com/rust-lang/rust/pull/100633/) - [Elaborate supertrait obligations when deducing closure signatures.](https://github.com/rust-lang/rust/pull/101834/) - [Invalid literals are no longer an error under `cfg(FALSE)`.](https://github.com/rust-lang/rust/pull/102944/) - [Unreserve braced enum variants in value namespace.](https://github.com/rust-lang/rust/pull/103578/) Compiler -------- - [Enable varargs support for calling conventions other than `C` or `cdecl`.](https://github.com/rust-lang/rust/pull/97971/) - [Add new MIR constant propagation based on dataflow analysis.](https://github.com/rust-lang/rust/pull/101168/) - [Optimize field ordering by grouping m\*2^n-sized fields with equivalently aligned ones.](https://github.com/rust-lang/rust/pull/102750/) - [Stabilize native library modifier `verbatim`.](https://github.com/rust-lang/rust/pull/104360/) Added, updated, and removed targets: - [Add a tier 3 target for PowerPC on AIX](https://github.com/rust-lang/rust/pull/102293/), `powerpc64-ibm-aix`. - [Add a tier 3 target for the Sony PlayStation 1](https://github.com/rust-lang/rust/pull/102689/), `mipsel-sony-psx`. - [Add tier 3 `no_std` targets for the QNX Neutrino RTOS](https://github.com/rust-lang/rust/pull/102701/), `aarch64-unknown-nto-qnx710` and `x86_64-pc-nto-qnx710`. - [Promote UEFI targets to tier 2](https://github.com/rust-lang/rust/pull/103933/), `aarch64-unknown-uefi`, `i686-unknown-uefi`, and `x86_64-unknown-uefi`. - [Remove tier 3 `linuxkernel` targets](https://github.com/rust-lang/rust/pull/104015/) (not used by the actual kernel). Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Merge `crossbeam-channel` into `std::sync::mpsc`.](https://github.com/rust-lang/rust/pull/93563/) - [Fix inconsistent rounding of 0.5 when formatted to 0 decimal places.](https://github.com/rust-lang/rust/pull/102935/) - [Derive `Eq` and `Hash` for `ControlFlow`.](https://github.com/rust-lang/rust/pull/103084/) - [Don't build `compiler_builtins` with `-C panic=abort`.](https://github.com/rust-lang/rust/pull/103786/) Stabilized APIs --------------- - [`{integer}::checked_ilog`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog) - [`{integer}::checked_ilog2`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog2) - [`{integer}::checked_ilog10`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog10) - [`{integer}::ilog`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog) - [`{integer}::ilog2`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog2) - [`{integer}::ilog10`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog10) - [`NonZeroU*::ilog2`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#method.ilog2) - [`NonZeroU*::ilog10`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#method.ilog10) - [`NonZero*::BITS`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#associatedconstant.BITS) These APIs are now stable in const contexts: - [`char::from_u32`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.from_u32) - [`char::from_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.from_digit) - [`char::to_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_digit) - [`core::char::from_u32`](https://doc.rust-lang.org/stable/core/char/fn.from_u32.html) - [`core::char::from_digit`](https://doc.rust-lang.org/stable/core/char/fn.from_digit.html) Compatibility Notes ------------------- - [The layout of `repr(Rust)` types now groups m\*2^n-sized fields with equivalently aligned ones.](https://github.com/rust-lang/rust/pull/102750/) This is intended to be an optimization, but it is also known to increase type sizes in a few cases for the placement of enum tags. As a reminder, the layout of `repr(Rust)` types is an implementation detail, subject to change. - [0.5 now rounds to 0 when formatted to 0 decimal places.](https://github.com/rust-lang/rust/pull/102935/) This makes it consistent with the rest of floating point formatting that rounds ties toward even digits. - [Chains of `&&` and `||` will now drop temporaries from their sub-expressions in evaluation order, left-to-right.](https://github.com/rust-lang/rust/pull/103293/) Previously, it was "twisted" such that the _first_ expression dropped its temporaries _last_, after all of the other expressions dropped in order. - [Underscore suffixes on string literals are now a hard error.](https://github.com/rust-lang/rust/pull/103914/) This has been a future-compatibility warning since 1.20.0. - [Stop passing `-export-dynamic` to `wasm-ld`.](https://github.com/rust-lang/rust/pull/105405/) - [`main` is now mangled as `__main_void` on `wasm32-wasi`.](https://github.com/rust-lang/rust/pull/105468/) - [Cargo now emits an error if there are multiple registries in the configuration with the same index URL.](https://github.com/rust-lang/cargo/pull/10592) Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Rewrite LLVM's archive writer in Rust.](https://github.com/rust-lang/rust/pull/97485/) Version 1.66.1 (2023-01-10) =========================== - Added validation of SSH host keys for git URLs in Cargo ([CVE-2022-46176](https://www.cve.org/CVERecord?id=CVE-2022-46176)) Version 1.66.0 (2022-12-15) ========================== Language -------- - [Permit specifying explicit discriminants on all `repr(Int)` enums](https://github.com/rust-lang/rust/pull/95710/) ```rust #[repr(u8)] enum Foo { A(u8) = 0, B(i8) = 1, C(bool) = 42, } ``` - [Allow transmutes between the same type differing only in lifetimes](https://github.com/rust-lang/rust/pull/101520/) - [Change constant evaluation errors from a deny-by-default lint to a hard error](https://github.com/rust-lang/rust/pull/102091/) - [Trigger `must_use` on `impl Trait` for supertraits](https://github.com/rust-lang/rust/pull/102287/) This makes `impl ExactSizeIterator` respect the existing `#[must_use]` annotation on `Iterator`. - [Allow `..=X` in patterns](https://github.com/rust-lang/rust/pull/102275/) - [Uplift `clippy::for_loops_over_fallibles` lint into rustc](https://github.com/rust-lang/rust/pull/99696/) - [Stabilize `sym` operands in inline assembly](https://github.com/rust-lang/rust/pull/103168/) - [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101912/) - [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/) This is a soundness fix which may break code that was erroneously relying on this behavior. Compiler -------- - [Add armv5te-none-eabi and thumbv5te-none-eabi tier 3 targets](https://github.com/rust-lang/rust/pull/101329/) - Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. - [Add support for linking against macOS universal libraries](https://github.com/rust-lang/rust/pull/98736) Libraries --------- - [Fix `#[derive(Default)]` on a generic `#[default]` enum adding unnecessary `Default` bounds](https://github.com/rust-lang/rust/pull/101040/) - [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101821/) Stabilized APIs --------------- - [`proc_macro::Span::source_text`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.source_text) - [`uX::{checked_add_signed, overflowing_add_signed, saturating_add_signed, wrapping_add_signed}`](https://doc.rust-lang.org/stable/std/primitive.u8.html#method.checked_add_signed) - [`iX::{checked_add_unsigned, overflowing_add_unsigned, saturating_add_unsigned, wrapping_add_unsigned}`](https://doc.rust-lang.org/stable/std/primitive.i8.html#method.checked_add_unsigned) - [`iX::{checked_sub_unsigned, overflowing_sub_unsigned, saturating_sub_unsigned, wrapping_sub_unsigned}`](https://doc.rust-lang.org/stable/std/primitive.i8.html#method.checked_sub_unsigned) - [`BTreeSet::{first, last, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeSet.html#method.first) - [`BTreeMap::{first_key_value, last_key_value, first_entry, last_entry, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.first_key_value) - [Add `AsFd` implementations for stdio lock types on WASI.](https://github.com/rust-lang/rust/pull/101768/) - [`impl TryFrom> for Box<[T; N]>`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#impl-TryFrom%3CVec%3CT%2C%20Global%3E%3E-for-Box%3C%5BT%3B%20N%5D%2C%20Global%3E) - [`core::hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html) - [`Duration::try_from_secs_{f32,f64}`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.try_from_secs_f32) - [`Option::unzip`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unzip) - [`std::os::fd`](https://doc.rust-lang.org/stable/std/os/fd/index.html) Rustdoc ------- - [Add Rustdoc warning for invalid HTML tags in the documentation](https://github.com/rust-lang/rust/pull/101720/) Cargo ----- - [Added `cargo remove` to remove dependencies from Cargo.toml](https://doc.rust-lang.org/nightly/cargo/commands/cargo-remove.html) - [`cargo publish` now waits for the new version to be downloadable before exiting](https://github.com/rust-lang/cargo/pull/11062) See [detailed release notes](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-166-2022-12-15) for more. Compatibility Notes ------------------- - [Only apply `ProceduralMasquerade` hack to older versions of `rental`](https://github.com/rust-lang/rust/pull/94063/) - [Don't export `__heap_base` and `__data_end` on wasm32-wasi.](https://github.com/rust-lang/rust/pull/102385/) - [Don't export `__wasm_init_memory` on WebAssembly.](https://github.com/rust-lang/rust/pull/102426/) - [Only export `__tls_*` on wasm32-unknown-unknown.](https://github.com/rust-lang/rust/pull/102440/) - [Don't link to `libresolv` in libstd on Darwin](https://github.com/rust-lang/rust/pull/102766/) - [Update libstd's libc to 0.2.135 (to make `libstd` no longer pull in `libiconv.dylib` on Darwin)](https://github.com/rust-lang/rust/pull/103277/) - [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/) This is a soundness fix which may break code that was erroneously relying on this behavior. - [Make `order_dependent_trait_objects` show up in future-breakage reports](https://github.com/rust-lang/rust/pull/102635/) - [Change std::process::Command spawning to default to inheriting the parent's signal mask](https://github.com/rust-lang/rust/pull/101077/) Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Enable BOLT for LLVM compilation](https://github.com/rust-lang/rust/pull/94381/) - [Enable LTO for rustc_driver.so](https://github.com/rust-lang/rust/pull/101403/) Version 1.65.0 (2022-11-03) ========================== Language -------- - [Error on `as` casts of enums with `#[non_exhaustive]` variants](https://github.com/rust-lang/rust/pull/92744/) - [Stabilize `let else`](https://github.com/rust-lang/rust/pull/93628/) - [Stabilize generic associated types (GATs)](https://github.com/rust-lang/rust/pull/96709/) - [Add lints `let_underscore_drop` and `let_underscore_lock` from Clippy](https://github.com/rust-lang/rust/pull/97739/) - [Stabilize `break`ing from arbitrary labeled blocks ("label-break-value")](https://github.com/rust-lang/rust/pull/99332/) - [Uninitialized integers, floats, and raw pointers are now considered immediate UB](https://github.com/rust-lang/rust/pull/98919/). Usage of `MaybeUninit` is the correct way to work with uninitialized memory. - [Stabilize raw-dylib for Windows x86_64, aarch64, and thumbv7a](https://github.com/rust-lang/rust/pull/99916/) - [Do not allow `Drop` impl on foreign ADTs](https://github.com/rust-lang/rust/pull/99576/) Compiler -------- - [Stabilize -Csplit-debuginfo on Linux](https://github.com/rust-lang/rust/pull/98051/) - [Use niche-filling optimization even when multiple variants have data](https://github.com/rust-lang/rust/pull/94075/) - [Associated type projections are now verified to be well-formed prior to resolving the underlying type](https://github.com/rust-lang/rust/pull/99217/#issuecomment-1209365630) - [Stringify non-shorthand visibility correctly](https://github.com/rust-lang/rust/pull/100350/) - [Normalize struct field types when unsizing](https://github.com/rust-lang/rust/pull/101831/) - [Update to LLVM 15](https://github.com/rust-lang/rust/pull/99464/) - [Fix aarch64 call abi to correctly zeroext when needed](https://github.com/rust-lang/rust/pull/97800/) - [debuginfo: Generalize C++-like encoding for enums](https://github.com/rust-lang/rust/pull/98393/) - [Add `special_module_name` lint](https://github.com/rust-lang/rust/pull/94467/) - [Add support for generating unique profraw files by default when using `-C instrument-coverage`](https://github.com/rust-lang/rust/pull/100384/) - [Allow dynamic linking for iOS/tvOS targets](https://github.com/rust-lang/rust/pull/100636/) New targets: - [Add armv4t-none-eabi as a tier 3 target](https://github.com/rust-lang/rust/pull/100244/) - [Add powerpc64-unknown-openbsd and riscv64-unknown-openbsd as tier 3 targets](https://github.com/rust-lang/rust/pull/101025/) - Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Don't generate `PartialEq::ne` in derive(PartialEq)](https://github.com/rust-lang/rust/pull/98655/) - [Windows RNG: Use `BCRYPT_RNG_ALG_HANDLE` by default](https://github.com/rust-lang/rust/pull/101325/) - [Forbid mixing `System` with direct system allocator calls](https://github.com/rust-lang/rust/pull/101394/) - [Document no support for writing to non-blocking stdio/stderr](https://github.com/rust-lang/rust/pull/101416/) - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295) This also changes the safety conditions on `Layout::from_size_align_unchecked`. Stabilized APIs --------------- - [`std::backtrace::Backtrace`](https://doc.rust-lang.org/stable/std/backtrace/struct.Backtrace.html) - [`Bound::as_ref`](https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.as_ref) - [`std::io::read_to_string`](https://doc.rust-lang.org/stable/std/io/fn.read_to_string.html) - [`<*const T>::cast_mut`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_mut) - [`<*mut T>::cast_const`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_const) These APIs are now stable in const contexts: - [`<*const T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from) - [`<*mut T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from) Cargo ----- - [Apply GitHub fast path even for partial hashes](https://github.com/rust-lang/cargo/pull/10807/) - [Do not add home bin path to PATH if it's already there](https://github.com/rust-lang/cargo/pull/11023/) - [Take priority into account within the pending queue](https://github.com/rust-lang/cargo/pull/11032/). This slightly optimizes job scheduling by Cargo, with typically small improvements on larger crate graph builds. Compatibility Notes ------------------- - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295). This also changes the safety conditions on `Layout::from_size_align_unchecked`. - [`PollFn` now only implements `Unpin` if the closure is `Unpin`](https://github.com/rust-lang/rust/pull/102737). This is a possible breaking change if users were relying on the blanket unpin implementation. See discussion on the PR for details of why this change was made. - [Drop ExactSizeIterator impl from std::char::EscapeAscii](https://github.com/rust-lang/rust/pull/99880) This is a backwards-incompatible change to the standard library's surface area, but is unlikely to affect real world usage. - [Do not consider a single repeated lifetime eligible for elision in the return type](https://github.com/rust-lang/rust/pull/103450) This behavior was unintentionally changed in 1.64.0, and this release reverts that change by making this an error again. - [Reenable disabled early syntax gates as future-incompatibility lints](https://github.com/rust-lang/rust/pull/99935/) - [Update the minimum external LLVM to 13](https://github.com/rust-lang/rust/pull/100460/) - [Don't duplicate file descriptors into stdio fds](https://github.com/rust-lang/rust/pull/101426/) - [Sunset RLS](https://github.com/rust-lang/rust/pull/100863/) - [Deny usage of `#![cfg_attr(..., crate_type = ...)]` to set the crate type](https://github.com/rust-lang/rust/pull/99784/) This strengthens the forward compatibility lint deprecated_cfg_attr_crate_type_name to deny. - [`llvm-has-rust-patches` allows setting the build system to treat the LLVM as having Rust-specific patches](https://github.com/rust-lang/rust/pull/101072) This option may need to be set for distributions that are building Rust with a patched LLVM via `llvm-config`, not the built-in LLVM. - Combining three or more languages (e.g. Objective C, C++ and Rust) into one binary may hit linker limitations when using `lld`. For more information, see [issue 102754][102754]. [102754]: https://github.com/rust-lang/rust/issues/102754 Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Add `x.sh` and `x.ps1` shell scripts](https://github.com/rust-lang/rust/pull/99992/) - [compiletest: use target cfg instead of hard-coded tables](https://github.com/rust-lang/rust/pull/100260/) - [Use object instead of LLVM for reading bitcode from rlibs](https://github.com/rust-lang/rust/pull/98100/) - [Enable MIR inlining for optimized compilations](https://github.com/rust-lang/rust/pull/91743) This provides a 3-10% improvement in compiletimes for real world crates. See [perf results](https://perf.rust-lang.org/compare.html?start=aedf78e56b2279cc869962feac5153b6ba7001ed&end=0075bb4fad68e64b6d1be06bf2db366c30bc75e1&stat=instructions:u). Version 1.64.0 (2022-09-22) =========================== Language -------- - [Unions with mutable references or tuples of allowed types are now allowed](https://github.com/rust-lang/rust/pull/97995/) - It is now considered valid to deallocate memory pointed to by a shared reference `&T` [if every byte in `T` is inside an `UnsafeCell`](https://github.com/rust-lang/rust/pull/98017/) - Unused tuple struct fields are now warned against in an allow-by-default lint, [`unused_tuple_struct_fields`](https://github.com/rust-lang/rust/pull/95977/), similar to the existing warning for unused struct fields. This lint will become warn-by-default in the future. Compiler -------- - [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/) - Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. - [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/) - [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/) - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/) Libraries --------- - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/) - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/) - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/) - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/) - [`impl AsRawFd for {Arc,Box}`](https://github.com/rust-lang/rust/pull/97437/) - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/) - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/) - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/) Stabilized APIs --------------- - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html) - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html) - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html) - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul) - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow) - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul) - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow) - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs) - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs) - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs) - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs) - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs) - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs) - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add) - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two) - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add) - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group) - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir) - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file) These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`: - [`core::ffi::CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html) - [`core::ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html) - [`alloc::ffi::CString`](https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html) - [`alloc::ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html) - [`alloc::ffi::IntoStringError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html) - [`alloc::ffi::NulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html) These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`: - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html) - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html) - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html) - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html) - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html) - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html) - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html) - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html) - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html) - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html) - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html) - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html) - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html) These APIs are now usable in const contexts: - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html) Cargo ----- - [Packages can now inherit settings from the workspace so that the settings can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table) and [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table) for more details on how to define these common settings. - [Cargo commands can now accept multiple `--target` flags to build for multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget) config option may now take an array of multiple targets. - [The `--jobs` argument can now take a negative number to count backwards from the max CPUs.](https://github.com/rust-lang/cargo/pull/10844) - [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902) - [Added](https://github.com/rust-lang/cargo/pull/10838) the [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type) flag to `cargo rustc` to override the crate type. - [Significantly improved the performance fetching git dependencies from GitHub when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079) Misc ---- - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/) Compatibility Notes ------------------- - The minimum required versions for all `-linux-gnu` targets are now at least kernel 3.2 and glibc 2.17, for targets that previously supported older versions: [Increase the minimum linux-gnu versions](https://github.com/rust-lang/rust/pull/95026/) - [Network primitives are now implemented with the ideal Rust layout, not the C system layout](https://github.com/rust-lang/rust/pull/78802/). This can cause problems when transmuting the types. - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/) - [A soundness bug in `BTreeMap` was fixed](https://github.com/rust-lang/rust/pull/99413/) that allowed data it was borrowing to be dropped before the container. - [The Drop behavior of C-like enums cast to ints has changed](https://github.com/rust-lang/rust/pull/96862/). These are already discouraged by a compiler warning. - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/) - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/) - On the `thumbv6m-none-eabi` target, some incorrect `asm!` statements were erroneously accepted if they used the high registers (r8 to r14) as an input/output operand. [This is no longer accepted](https://github.com/rust-lang/rust/pull/99155/). - [`impl Trait` was accidentally accepted as the associated type value of return-position `impl Trait`](https://github.com/rust-lang/rust/pull/97346/), without fulfilling all the trait bounds of that associated type, as long as the hidden type satisfies said bounds. This has been fixed. Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - Windows builds now use profile-guided optimization, providing 10-20% improvements to compiler performance: [Utilize PGO for windows x64 rustc dist builds](https://github.com/rust-lang/rust/pull/96978/) - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/) - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/) - Many improvements to generated code for derives, including performance improvements: - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/) - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/) - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/) - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/) - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/) - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/) - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/) - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/) - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/) - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/) - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/) Version 1.63.0 (2022-08-11) ========================== Language -------- - [Remove migrate borrowck mode for pre-NLL errors.][95565] - [Modify MIR building to drop repeat expressions with length zero.][95953] - [Remove label/lifetime shadowing warnings.][96296] - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868] - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652] - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959] - [lub: don't bail out due to empty binders.][97867] Compiler -------- - [Stabilize the `bundle` native library modifier,][95818] also removing the deprecated `static-nobundle` linking kind. - [Add Apple WatchOS compile targets\*.][95243] - [Add a Windows application manifest to rustc-main.][96737] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530] - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954] - [`impl Read and Write for VecDeque`.][95632] - [STD support for the Nintendo 3DS.][95897] - [Use rounding in float to Duration conversion methods.][96051] - [Make write/print macros eagerly drop temporaries.][96455] - [Implement internal traits that enable `[OsStr]::join`.][96881] - [Implement `Hash` for `core::alloc::Layout`.][97034] - [Add capacity documentation for `OsString`.][97202] - [Put a bound on collection misbehavior.][97316] - [Make `std::mem::needs_drop` accept `?Sized`.][97675] - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803] - [Document Rust's stance on `/proc/self/mem`.][97837] Stabilized APIs --------------- - [`array::from_fn`] - [`Box::into_pin`] - [`BinaryHeap::try_reserve`] - [`BinaryHeap::try_reserve_exact`] - [`OsString::try_reserve`] - [`OsString::try_reserve_exact`] - [`PathBuf::try_reserve`] - [`PathBuf::try_reserve_exact`] - [`Path::try_exists`] - [`Ref::filter_map`] - [`RefMut::filter_map`] - [`NonNull::<[T]>::len`][`NonNull::::len`] - [`ToOwned::clone_into`] - [`Ipv6Addr::to_ipv4_mapped`] - [`unix::io::AsFd`] - [`unix::io::BorrowedFd<'fd>`] - [`unix::io::OwnedFd`] - [`windows::io::AsHandle`] - [`windows::io::BorrowedHandle<'handle>`] - [`windows::io::OwnedHandle`] - [`windows::io::HandleOrInvalid`] - [`windows::io::HandleOrNull`] - [`windows::io::InvalidHandleError`] - [`windows::io::NullHandleError`] - [`windows::io::AsSocket`] - [`windows::io::BorrowedSocket<'handle>`] - [`windows::io::OwnedSocket`] - [`thread::scope`] - [`thread::Scope`] - [`thread::ScopedJoinHandle`] These APIs are now usable in const contexts: - [`array::from_ref`] - [`slice::from_ref`] - [`intrinsics::copy`] - [`intrinsics::copy_nonoverlapping`] - [`<*const T>::copy_to`] - [`<*const T>::copy_to_nonoverlapping`] - [`<*mut T>::copy_to`] - [`<*mut T>::copy_to_nonoverlapping`] - [`<*mut T>::copy_from`] - [`<*mut T>::copy_from_nonoverlapping`] - [`str::from_utf8`] - [`Utf8Error::error_len`] - [`Utf8Error::valid_up_to`] - [`Condvar::new`] - [`Mutex::new`] - [`RwLock::new`] Cargo ----- - [Stabilize the `--config path` command-line argument.][cargo/10755] - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713] Compatibility Notes ------------------- - [`#[link]` attributes are now checked more strictly,][96885] which may introduce errors for invalid attribute arguments that were previously ignored. - [Rounding is now used when converting a float to a `Duration`.][96051] The converted duration can differ slightly from what it was. Internal Changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Prepare Rust for LLVM opaque pointers.][94214] [94214]: https://github.com/rust-lang/rust/pull/94214/ [94530]: https://github.com/rust-lang/rust/pull/94530/ [94954]: https://github.com/rust-lang/rust/pull/94954/ [95243]: https://github.com/rust-lang/rust/pull/95243/ [95565]: https://github.com/rust-lang/rust/pull/95565/ [95632]: https://github.com/rust-lang/rust/pull/95632/ [95818]: https://github.com/rust-lang/rust/pull/95818/ [95897]: https://github.com/rust-lang/rust/pull/95897/ [95953]: https://github.com/rust-lang/rust/pull/95953/ [96051]: https://github.com/rust-lang/rust/pull/96051/ [96296]: https://github.com/rust-lang/rust/pull/96296/ [96455]: https://github.com/rust-lang/rust/pull/96455/ [96737]: https://github.com/rust-lang/rust/pull/96737/ [96868]: https://github.com/rust-lang/rust/pull/96868/ [96881]: https://github.com/rust-lang/rust/pull/96881/ [96885]: https://github.com/rust-lang/rust/pull/96885/ [96959]: https://github.com/rust-lang/rust/pull/96959/ [97034]: https://github.com/rust-lang/rust/pull/97034/ [97202]: https://github.com/rust-lang/rust/pull/97202/ [97316]: https://github.com/rust-lang/rust/pull/97316/ [97652]: https://github.com/rust-lang/rust/pull/97652/ [97675]: https://github.com/rust-lang/rust/pull/97675/ [97803]: https://github.com/rust-lang/rust/pull/97803/ [97837]: https://github.com/rust-lang/rust/pull/97837/ [97867]: https://github.com/rust-lang/rust/pull/97867/ [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/ [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/ [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map [`NonNull::::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new Version 1.62.1 (2022-07-19) ========================== Rust 1.62.1 addresses a few recent regressions in the compiler and standard library, and also mitigates a CPU vulnerability on Intel SGX. * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608] * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890] * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950] * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615]. [98608]: https://github.com/rust-lang/rust/issues/98608 [98890]: https://github.com/rust-lang/rust/issues/98890 [98950]: https://github.com/rust-lang/rust/pull/98950 [98126]: https://github.com/rust-lang/rust/pull/98126 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html Version 1.62.0 (2022-06-30) ========================== Language -------- - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457] - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313] - [Fix constants not getting dropped if part of a diverging expression][94775] - [Support unit struct/enum variant in destructuring assignment][95380] - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268] - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346] Compiler -------- - [linker: Stop using whole-archive on dependencies of dylibs][96436] - [Make `unaligned_references` lint deny-by-default][95372] This lint is also a future compatibility lint, and is expected to eventually become a hard error. - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969] - [Reject `#[thread_local]` attribute on non-static items][95006] - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872] - [Implement a lint to warn about unused macro rules][96150] - [Promote `x86_64-unknown-none` target to Tier 2\*][95705] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Windows: Use a pipe relay for chaining pipes][95841] - [Replace Linux Mutex and Condvar with futex based ones.][95035] - [Replace RwLock by a futex based one on Linux][95801] - [std: directly use pthread in UNIX parker implementation][96393] Stabilized APIs --------------- - [`bool::then_some`] - [`f32::total_cmp`] - [`f64::total_cmp`] - [`Stdin::lines`] - [`windows::CommandExt::raw_arg`] - [`impl Default for AssertUnwindSafe`] - [`From> for Rc<[u8]>`][rc-u8-from-str] - [`From> for Arc<[u8]>`][arc-u8-from-str] - [`FusedIterator for EncodeWide`] - [RDM intrinsics on aarch64][stdarch/1285] Clippy ------ - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206] Cargo ----- - Added the `cargo add` command for adding dependencies to `Cargo.toml` from the command-line. [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html) - Package ID specs now support `name@version` syntax in addition to the previous `name:version` to align with the behavior in `cargo add` and other tools. `cargo install` and `cargo yank` also now support this syntax so the version does not need to passed as a separate flag. - The `git` and `registry` directories in Cargo's home directory (usually `~/.cargo`) are now marked as cache directories so that they are not included in backups or content indexing (on Windows). - Added automatic `@` argfile support, which will use "response files" if the command-line to `rustc` exceeds the operating system's limit. Compatibility Notes ------------------- - `cargo test` now passes `--target` to `rustdoc` if the specified target is the same as the host target. [#10594](https://github.com/rust-lang/cargo/pull/10594) - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630] - [rustdoc: Remove .woff font files][96279] - [Enforce Copy bounds for repeat elements while considering lifetimes][95819] - [Windows: Fix potential unsoundness by aborting if `File` reads or writes cannot complete synchronously][95469]. Internal Changes ---------------- - [Unify ReentrantMutex implementations across all platforms][96042] These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. [93313]: https://github.com/rust-lang/rust/pull/93313/ [93969]: https://github.com/rust-lang/rust/pull/93969/ [94206]: https://github.com/rust-lang/rust/pull/94206/ [94457]: https://github.com/rust-lang/rust/pull/94457/ [94775]: https://github.com/rust-lang/rust/pull/94775/ [94872]: https://github.com/rust-lang/rust/pull/94872/ [95006]: https://github.com/rust-lang/rust/pull/95006/ [95035]: https://github.com/rust-lang/rust/pull/95035/ [95346]: https://github.com/rust-lang/rust/pull/95346/ [95372]: https://github.com/rust-lang/rust/pull/95372/ [95380]: https://github.com/rust-lang/rust/pull/95380/ [95431]: https://github.com/rust-lang/rust/pull/95431/ [95469]: https://github.com/rust-lang/rust/pull/95469/ [95705]: https://github.com/rust-lang/rust/pull/95705/ [95801]: https://github.com/rust-lang/rust/pull/95801/ [95819]: https://github.com/rust-lang/rust/pull/95819/ [95841]: https://github.com/rust-lang/rust/pull/95841/ [96042]: https://github.com/rust-lang/rust/pull/96042/ [96150]: https://github.com/rust-lang/rust/pull/96150/ [96268]: https://github.com/rust-lang/rust/pull/96268/ [96279]: https://github.com/rust-lang/rust/pull/96279/ [96393]: https://github.com/rust-lang/rust/pull/96393/ [96436]: https://github.com/rust-lang/rust/pull/96436/ [96557]: https://github.com/rust-lang/rust/pull/96557/ [96630]: https://github.com/rust-lang/rust/pull/96630/ [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines [`impl Default for AssertUnwindSafe`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator Version 1.61.0 (2022-05-19) ========================== Language -------- - [`const fn` signatures can now include generic trait bounds][93827] - [`const fn` signatures can now use `impl Trait` in argument and return position][93827] - [Function pointers can now be created, cast, and passed around in a `const fn`][93827] - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081] Compiler -------- - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901] - [The `char` type is now described as UTF-32 in debuginfo][89887] - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621] - X86 [`#[target_feature = "adx"]` is now stable][93745] Libraries --------- - [`ManuallyDrop` is now documented to have the same layout as `T`][88375] - [`#[ignore = "…"]` messages are printed when running tests][92714] - [Consistently show absent stdio handles on Windows as NULL handles][93263] - [Make `std::io::stdio::lock()` return `'static` handles.][93965] Previously, the creation of locked handles to stdin/stdout/stderr would borrow the handles being locked, which prevented writing `let out = std::io::stdout().lock();` because `out` would outlive the return value of `stdout()`. Such code now works, eliminating a common pitfall that affected many Rust users. - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016] - [`std::thread::available_parallelism` now takes cgroup quotas into account.][92697] Since `available_parallelism` is often used to create a thread pool for parallel computation, which may be CPU-bound for performance, `available_parallelism` will return a value consistent with the ability to use that many threads continuously, if possible. For instance, in a container with 8 virtual CPUs but quotas only allowing for 50% usage, `available_parallelism` will return 4. Stabilized APIs --------------- - [`Pin::static_mut`] - [`Pin::static_ref`] - [`Vec::retain_mut`] - [`VecDeque::retain_mut`] - [`Write` for `Cursor<[u8; N]>`][cursor-write-array] - [`std::os::unix::net::SocketAddr::from_pathname`] - [`std::process::ExitCode`] and [`std::process::Termination`]. The stabilization of these two APIs now makes it possible for programs to return errors from `main` with custom exit codes. - [`std::thread::JoinHandle::is_finished`] These APIs are now usable in const contexts: - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset] - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset] - [`<*const T>::add` and `<*mut T>::add`][ptr-add] - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub] - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add] - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub] - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr] - [`<[T]>::as_ptr_range`][slice-as_ptr_range] - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range] Cargo ----- No feature changes, but see compatibility notes. Compatibility Notes ------------------- - Previously native static libraries were linked as `whole-archive` in some cases, but now rustc tries not to use `whole-archive` unless explicitly requested. This [change][93901] may result in linking errors in some cases. To fix such errors, native libraries linked from the command line, build scripts, or [`#[link]` attributes][link-attr] need to - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second) - (less common) or be updated to use the [`+whole-archive`] modifier. - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911] - [Proc macros no longer see `ident` matchers wrapped in groups][92472] - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251] - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285] - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448] - [`cfg` predicates in `all()` and `any()` are always evaluated to detect errors, instead of short-circuiting.][94295] The compatibility considerations here arise in nightly-only code that used the short-circuiting behavior of `all` to write something like `cfg(all(feature = "nightly", syntax-requiring-nightly))`, which will now fail to compile. Instead, use either `cfg_attr(feature = "nightly", ...)` or nested uses of `cfg`. - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832] Internal Changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [debuginfo: Refactor debuginfo generation for types][94261] - [Remove the everybody loops pass][93913] [88375]: https://github.com/rust-lang/rust/pull/88375/ [89887]: https://github.com/rust-lang/rust/pull/89887/ [90621]: https://github.com/rust-lang/rust/pull/90621/ [92285]: https://github.com/rust-lang/rust/pull/92285/ [92472]: https://github.com/rust-lang/rust/pull/92472/ [92697]: https://github.com/rust-lang/rust/pull/92697/ [92714]: https://github.com/rust-lang/rust/pull/92714/ [92911]: https://github.com/rust-lang/rust/pull/92911/ [93263]: https://github.com/rust-lang/rust/pull/93263/ [93745]: https://github.com/rust-lang/rust/pull/93745/ [93827]: https://github.com/rust-lang/rust/pull/93827/ [93901]: https://github.com/rust-lang/rust/pull/93901/ [93913]: https://github.com/rust-lang/rust/pull/93913/ [93965]: https://github.com/rust-lang/rust/pull/93965/ [94081]: https://github.com/rust-lang/rust/pull/94081/ [94261]: https://github.com/rust-lang/rust/pull/94261/ [94295]: https://github.com/rust-lang/rust/pull/94295/ [94832]: https://github.com/rust-lang/rust/pull/94832/ [95016]: https://github.com/rust-lang/rust/pull/95016/ [95251]: https://github.com/rust-lang/rust/pull/95251/ [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/ [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute Version 1.60.0 (2022-04-07) ========================== Language -------- - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658] - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824] Compiler -------- - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374] - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487] - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132] - [Stabilize `-Z print-link-args` as `--print link-args`][91606] - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300] - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383] - [Fix invalid removal of newlines from doc comments][92357] - [Add kernel target for RustyHermit][92670] - [Deny mixing bin crate type with lib crate types][92933] - [Make rustc use `RUST_BACKTRACE=full` by default][93566] - [Upgrade to LLVM 14][93577] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Guarantee call order for `sort_by_cached_key`][89621] - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247] - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926] - [Remove non-monotonic clocks workarounds in `Instant::now`][89926] - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630] Stabilized APIs --------------- - [`Arc::new_cyclic`][arc_new_cyclic] - [`Rc::new_cyclic`][rc_new_cyclic] - [`slice::EscapeAscii`][slice_escape_ascii] - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii] - [`u8::escape_ascii`][u8_escape_ascii] - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut] - [`MaybeUninit::assume_init_drop`][assume_init_drop] - [`MaybeUninit::assume_init_read`][assume_init_read] - [`i8::abs_diff`][i8_abs_diff] - [`i16::abs_diff`][i16_abs_diff] - [`i32::abs_diff`][i32_abs_diff] - [`i64::abs_diff`][i64_abs_diff] - [`i128::abs_diff`][i128_abs_diff] - [`isize::abs_diff`][isize_abs_diff] - [`u8::abs_diff`][u8_abs_diff] - [`u16::abs_diff`][u16_abs_diff] - [`u32::abs_diff`][u32_abs_diff] - [`u64::abs_diff`][u64_abs_diff] - [`u128::abs_diff`][u128_abs_diff] - [`usize::abs_diff`][usize_abs_diff] - [`Display for io::ErrorKind`][display_error_kind] - [`From for ExitCode`][from_u8_exit_code] - [`Not for !` (the "never" type)][not_never] - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops] - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected] Cargo ----- - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086] - [Stabilize `-Ztimings` as `--timings`][cargo/10245] - [Stabilize namespaced and weak dependency features.][cargo/10269] - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274] - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379] Misc ---- - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800] - [Drop rustc-docs from complete profile][93742] - [bootstrap: tidy up flag handling for llvm build][93918] Compatibility Notes ------------------- - [Remove compiler-rt linking hack on Android][83822] - [Mitigations for platforms with non-monotonic clocks have been removed from `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an instant is not guaranteed to be greater than an earlier instant anymore. - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow, saturating to `0` instead][89926]. In the real world the panic happened mostly on platforms with buggy monotonic clock implementations rather than catching programming errors like reversing the start and end times. Such programming errors will now results in `0` rather than a panic. - In a future release we're planning to increase the baseline requirements for the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love your feedback in [PR #95026][95026]. Internal Changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Switch all libraries to the 2021 edition][92068] [83822]: https://github.com/rust-lang/rust/pull/83822 [86374]: https://github.com/rust-lang/rust/pull/86374 [87487]: https://github.com/rust-lang/rust/pull/87487 [89621]: https://github.com/rust-lang/rust/pull/89621 [89926]: https://github.com/rust-lang/rust/pull/89926 [90132]: https://github.com/rust-lang/rust/pull/90132 [90247]: https://github.com/rust-lang/rust/pull/90247 [91606]: https://github.com/rust-lang/rust/pull/91606 [92068]: https://github.com/rust-lang/rust/pull/92068 [92300]: https://github.com/rust-lang/rust/pull/92300 [92357]: https://github.com/rust-lang/rust/pull/92357 [92383]: https://github.com/rust-lang/rust/pull/92383 [92630]: https://github.com/rust-lang/rust/pull/92630 [92670]: https://github.com/rust-lang/rust/pull/92670 [92800]: https://github.com/rust-lang/rust/pull/92800 [92933]: https://github.com/rust-lang/rust/pull/92933 [93566]: https://github.com/rust-lang/rust/pull/93566 [93577]: https://github.com/rust-lang/rust/pull/93577 [93658]: https://github.com/rust-lang/rust/pull/93658 [93742]: https://github.com/rust-lang/rust/pull/93742 [93824]: https://github.com/rust-lang/rust/pull/93824 [93918]: https://github.com/rust-lang/rust/pull/93918 [95026]: https://github.com/rust-lang/rust/pull/95026 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html Version 1.59.0 (2022-02-24) ========================== Language -------- - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207] - [Stabilize destructuring assignment][90521] - [Relax private in public lint on generic bounds and where clauses of trait impls][90586] - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728] Compiler -------- - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128] - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833] - [Fix sparc64 ABI for aggregates with floating point members][91003] - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172] - [Add support for riscv64gc-unknown-freebsd][91284] - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535] - [Soft disable incremental compilation][94124] This release disables incremental compilation, unless the user has explicitly opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable. This is due to a known and relatively frequently occurring bug in incremental compilation, which causes builds to issue internal compiler errors. This particular bug is already fixed on nightly, but that fix has not yet rolled out to stable and is deemed too risky for a direct stable backport. As always, we encourage users to test with nightly and report bugs so that we can track failures and fix issues earlier. See [94124] for more details. [94124]: https://github.com/rust-lang/rust/issues/94124 Libraries --------- - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593] Stabilized APIs --------------- - [`std::thread::available_parallelism`][available_parallelism] - [`Result::copied`][result-copied] - [`Result::cloned`][result-cloned] - [`arch::asm!`][asm] - [`arch::global_asm!`][global_asm] - [`ops::ControlFlow::is_break`][is_break] - [`ops::ControlFlow::is_continue`][is_continue] - [`TryFrom for u8`][try_from_char_u8] - [`char::TryFromCharError`][try_from_char_err] implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error` - [`iter::zip`][zip] - [`NonZeroU8::is_power_of_two`][is_power_of_two8] - [`NonZeroU16::is_power_of_two`][is_power_of_two16] - [`NonZeroU32::is_power_of_two`][is_power_of_two32] - [`NonZeroU64::is_power_of_two`][is_power_of_two64] - [`NonZeroU128::is_power_of_two`][is_power_of_two128] - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize] - [`DoubleEndedIterator for ToLowercase`][lowercase] - [`DoubleEndedIterator for ToUppercase`][uppercase] - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr] - [`UnwindSafe for Once`][unwindsafe_once] - [`RefUnwindSafe for Once`][refunwindsafe_once] - [armv8 neon intrinsics for aarch64][stdarch/1266] Const-stable: - [`mem::MaybeUninit::as_ptr`][muninit_ptr] - [`mem::MaybeUninit::assume_init`][muninit_init] - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref] - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes] Cargo ----- - [Stabilize the `strip` profile option][cargo/10088] - [Stabilize future-incompat-report][cargo/10165] - [Support abbreviating `--release` as `-r`][cargo/10133] - [Support `term.quiet` configuration][cargo/10152] - [Remove `--host` from cargo {publish,search,login}][cargo/10145] Compatibility Notes ------------------- - [Refactor weak symbols in std::sys::unix][90846] This may add new, versioned, symbols when building with a newer glibc, as the standard library uses weak linkage rather than dynamically attempting to load certain symbols at runtime. - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744] This adds a future compatibility lint to supporting the use of cfg_attr wrapping either crate_type or crate_name specification within Rust files; it is recommended that users migrate to setting the equivalent command line flags. - [Remove effect of `#[no_link]` attribute on name resolution][92034] This may expose new names, leading to conflicts with preexisting names in a given namespace and a compilation failure. - [Cargo will document libraries before binaries.][cargo/10172] - [Respect doc=false in dependencies, not just the root crate][cargo/10201] - [Weaken guarantee around advancing underlying iterators in zip][83791] - [Make split_inclusive() on an empty slice yield an empty output][89825] - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999] - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137] Internal Changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Fix many cases of normalization-related ICEs][91255] - [Replace dominators algorithm with simple Lengauer-Tarjan][85013] - [Store liveness in interval sets for region inference][90637] - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this unstable feature.][91867] [91867]: https://github.com/rust-lang/rust/issues/91867 [83744]: https://github.com/rust-lang/rust/pull/83744/ [83791]: https://github.com/rust-lang/rust/pull/83791/ [85013]: https://github.com/rust-lang/rust/pull/85013/ [89825]: https://github.com/rust-lang/rust/pull/89825/ [89999]: https://github.com/rust-lang/rust/pull/89999/ [90128]: https://github.com/rust-lang/rust/pull/90128/ [90207]: https://github.com/rust-lang/rust/pull/90207/ [90521]: https://github.com/rust-lang/rust/pull/90521/ [90586]: https://github.com/rust-lang/rust/pull/90586/ [90637]: https://github.com/rust-lang/rust/pull/90637/ [90833]: https://github.com/rust-lang/rust/pull/90833/ [90846]: https://github.com/rust-lang/rust/pull/90846/ [91003]: https://github.com/rust-lang/rust/pull/91003/ [91172]: https://github.com/rust-lang/rust/pull/91172/ [91255]: https://github.com/rust-lang/rust/pull/91255/ [91284]: https://github.com/rust-lang/rust/pull/91284/ [91535]: https://github.com/rust-lang/rust/pull/91535/ [91593]: https://github.com/rust-lang/rust/pull/91593/ [91728]: https://github.com/rust-lang/rust/pull/91728/ [91878]: https://github.com/rust-lang/rust/pull/91878/ [91896]: https://github.com/rust-lang/rust/pull/91896/ [91926]: https://github.com/rust-lang/rust/pull/91926/ [91984]: https://github.com/rust-lang/rust/pull/91984/ [92020]: https://github.com/rust-lang/rust/pull/92020/ [92034]: https://github.com/rust-lang/rust/pull/92034/ [92137]: https://github.com/rust-lang/rust/pull/92137/ [92483]: https://github.com/rust-lang/rust/pull/92483/ [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/ [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/ [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/ [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/ [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/ [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/ [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/ [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/ [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266 Version 1.58.1 (2022-01-20) =========================== * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658]) * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295] * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075] * [Fix wrong error message displayed when some imports are missing][91254] * [Fix rustfmt not formatting generated files from stdin][92912] [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658 [91254]: https://github.com/rust-lang/rust/pull/91254 [92912]: https://github.com/rust-lang/rust/pull/92912 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295 Version 1.58.0 (2022-01-13) ========================== Language -------- - [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect. - [`*const T` pointers can now be dereferenced in const contexts.][89551] - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417] Compiler -------- - [Add LLVM CFI support to the Rust compiler][89652] - [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo. - [Add support for LLVM coverage mapping format versions 5 and 6][91207] - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833] - [Update the minimum external LLVM to 12][90175] - [Add `x86_64-unknown-none` at Tier 3*][89062] - [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries. - [Don't abort compilation after giving a lint error][87337] - [Error messages point at the source of trait bound obligations in more places][89580] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value. - [Paths are automatically canonicalized on Windows for operations that support it][89174] - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041] - [Implement `RefUnwindSafe` for `Rc`][87467] - [Make RSplit: Clone not require T: Clone][90117] - [Implement `Termination` for `Result`][88601]. This allows writing `fn main() -> Result`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program). Stabilized APIs --------------- - [`Metadata::is_symlink`] - [`Path::is_symlink`] - [`{integer}::saturating_div`] - [`Option::unwrap_unchecked`] - [`Result::unwrap_unchecked`] - [`Result::unwrap_err_unchecked`] - [`File::options`] These APIs are now usable in const contexts: - [`Duration::new`] - [`Duration::checked_add`] - [`Duration::saturating_add`] - [`Duration::checked_sub`] - [`Duration::saturating_sub`] - [`Duration::checked_mul`] - [`Duration::saturating_mul`] - [`Duration::checked_div`] Cargo ----- - [Add --message-format for install command][cargo/10107] - [Warn when alias shadows external subcommand][cargo/10082] Rustdoc ------- - [Show all Deref implementations recursively in rustdoc][90183] - [Use computed visibility in rustdoc][88447] Compatibility Notes ------------------- - [Try all stable method candidates first before trying unstable ones][90329]. This change ensures that adding new nightly-only methods to the Rust standard library will not break code invoking methods of the same name from traits outside the standard library. - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704] - [All proc-macro backward-compatibility lints are now deny-by-default.][88041] - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297] - [Refactor weak symbols in std::sys::unix][90846]. This optimizes accesses to glibc functions, by avoiding the use of dlopen. This does not increase the [minimum expected version of glibc](https://doc.rust-lang.org/nightly/rustc/platform-support.html). However, software distributions that use symbol versions to detect library dependencies, and which take weak symbols into account in that analysis, may detect rust binaries as requiring newer versions of glibc. - [rustdoc now rejects some unexpected semicolons in doctests][91026] Internal Changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Implement coherence checks for negative trait impls][90104] - [Add rustc lint, warning when iterating over hashmaps][89558] - [Optimize live point computation][90491] - [Enable verification for 1/32nd of queries loaded from disk][90361] - [Implement version of normalize_erasing_regions that allows for normalization failure][91255] [87337]: https://github.com/rust-lang/rust/pull/87337/ [87467]: https://github.com/rust-lang/rust/pull/87467/ [87704]: https://github.com/rust-lang/rust/pull/87704/ [88041]: https://github.com/rust-lang/rust/pull/88041/ [88447]: https://github.com/rust-lang/rust/pull/88447/ [88601]: https://github.com/rust-lang/rust/pull/88601/ [89062]: https://github.com/rust-lang/rust/pull/89062/ [89174]: https://github.com/rust-lang/rust/pull/89174/ [89551]: https://github.com/rust-lang/rust/pull/89551/ [89558]: https://github.com/rust-lang/rust/pull/89558/ [89580]: https://github.com/rust-lang/rust/pull/89580/ [89652]: https://github.com/rust-lang/rust/pull/89652/ [90041]: https://github.com/rust-lang/rust/pull/90041/ [90058]: https://github.com/rust-lang/rust/pull/90058/ [90104]: https://github.com/rust-lang/rust/pull/90104/ [90117]: https://github.com/rust-lang/rust/pull/90117/ [90175]: https://github.com/rust-lang/rust/pull/90175/ [90183]: https://github.com/rust-lang/rust/pull/90183/ [90297]: https://github.com/rust-lang/rust/pull/90297/ [90329]: https://github.com/rust-lang/rust/pull/90329/ [90361]: https://github.com/rust-lang/rust/pull/90361/ [90417]: https://github.com/rust-lang/rust/pull/90417/ [90473]: https://github.com/rust-lang/rust/pull/90473/ [90491]: https://github.com/rust-lang/rust/pull/90491/ [90733]: https://github.com/rust-lang/rust/pull/90733/ [90833]: https://github.com/rust-lang/rust/pull/90833/ [90846]: https://github.com/rust-lang/rust/pull/90846/ [91026]: https://github.com/rust-lang/rust/pull/91026/ [91207]: https://github.com/rust-lang/rust/pull/91207/ [91255]: https://github.com/rust-lang/rust/pull/91255/ [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/ [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/ [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new Version 1.57.0 (2021-12-02) ========================== Language -------- - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220] - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690] - [Allow panicking in constant evaluation.][89508] - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200] Compiler -------- - [Create more accurate debuginfo for vtables.][89597] - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529] - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952] - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321] - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf` \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Avoid allocations and copying in `Vec::leak`][89337] - [Add `#[repr(i8)]` to `Ordering`][89507] - [Optimize `File::read_to_end` and `read_to_string`][89582] - [Update to Unicode 14.0][89614] - [Many more functions are marked `#[must_use]`][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value. Stabilised APIs --------------- - [`[T; N]::as_mut_slice`][`array::as_mut_slice`] - [`[T; N]::as_slice`][`array::as_slice`] - [`collections::TryReserveError`] - [`HashMap::try_reserve`] - [`HashSet::try_reserve`] - [`String::try_reserve`] - [`String::try_reserve_exact`] - [`Vec::try_reserve`] - [`Vec::try_reserve_exact`] - [`VecDeque::try_reserve`] - [`VecDeque::try_reserve_exact`] - [`Iterator::map_while`] - [`iter::MapWhile`] - [`proc_macro::is_available`] - [`Command::get_program`] - [`Command::get_args`] - [`Command::get_envs`] - [`Command::get_current_dir`] - [`CommandArgs`] - [`CommandEnvs`] These APIs are now usable in const contexts: - [`hint::unreachable_unchecked`] Cargo ----- - [Stabilize custom profiles][cargo/9943] Compatibility notes ------------------- - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200] This will break some builds that set `#![deny(dead_code)]`. Internal changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Added an experimental backend for codegen with `libgccjit`.][87260] [85200]: https://github.com/rust-lang/rust/pull/85200/ [86191]: https://github.com/rust-lang/rust/pull/86191/ [87220]: https://github.com/rust-lang/rust/pull/87220/ [87260]: https://github.com/rust-lang/rust/pull/87260/ [88321]: https://github.com/rust-lang/rust/pull/88321/ [88529]: https://github.com/rust-lang/rust/pull/88529/ [88690]: https://github.com/rust-lang/rust/pull/88690/ [88952]: https://github.com/rust-lang/rust/pull/88952/ [89337]: https://github.com/rust-lang/rust/pull/89337/ [89507]: https://github.com/rust-lang/rust/pull/89507/ [89508]: https://github.com/rust-lang/rust/pull/89508/ [89582]: https://github.com/rust-lang/rust/pull/89582/ [89597]: https://github.com/rust-lang/rust/pull/89597/ [89614]: https://github.com/rust-lang/rust/pull/89614/ [89692]: https://github.com/rust-lang/rust/issues/89692/ [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/ [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html Version 1.56.1 (2021-11-01) =========================== - New lints to detect the presence of bidirectional-override Unicode codepoints in the compiled source code ([CVE-2021-42574]) [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574 Version 1.56.0 (2021-10-21) ======================== Language -------- - [The 2021 Edition is now stable.][rust#88100] See [the edition guide][rust-2021-edition-guide] for more details. - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305] - [Union field access is permitted in `const fn`.][rust#85769] [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html Compiler -------- - [Upgrade to LLVM 13.][rust#87570] - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023] - [Allow specifying a deployment target version for all iOS targets][rust#87699] - [Warnings can be forced on with `--force-warn`.][rust#87472] This feature is primarily intended for usage by `cargo fix`, rather than end users. - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760] - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370] - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342] The Windows console still requires valid Unicode, but this change allows splitting a UTF-8 character across multiple write calls. This allows, for instance, programs that just read and write data buffers (e.g. copying a file to stdout) without regard for Unicode or character boundaries. - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093] For this use case, atomics scale much better under contention. - [Implement `Extend<(A, B)>` for `(Extend, Extend)`][rust#85835] - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744] - [`impl From<[(K, V); N]>` for all collections.][rust#84111] - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363] - [Treat invalid environment variable names as nonexistent.][rust#86183] Previously, the environment functions would panic if given a variable name with an internal null character or equal sign (`=`). Now, these functions will just treat such names as nonexistent variables, since the OS cannot represent the existence of a variable with such a name. Stabilised APIs --------------- - [`std::os::unix::fs::chroot`] - [`UnsafeCell::raw_get`] - [`BufWriter::into_parts`] - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`] These APIs were previously stable in `std`, but are now also available in `core`. - [`Vec::shrink_to`] - [`String::shrink_to`] - [`OsString::shrink_to`] - [`PathBuf::shrink_to`] - [`BinaryHeap::shrink_to`] - [`VecDeque::shrink_to`] - [`HashMap::shrink_to`] - [`HashSet::shrink_to`] These APIs are now usable in const contexts: - [`std::mem::transmute`] - [`[T]::first`][`slice::first`] - [`[T]::split_first`][`slice::split_first`] - [`[T]::last`][`slice::last`] - [`[T]::split_last`][`slice::split_last`] Cargo ----- - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`] This has no effect at present on dependency version selection. We encourage crates to specify their minimum supported Rust version, and we encourage CI systems that support Rust code to include a crate's specified minimum version in the test matrix for that crate by default. Compatibility notes ------------------- - [Update to new argument parsing rules on Windows.][rust#87580] This adjusts Rust's standard library to match the behavior of the standard libraries for C/C++. The rules have changed slightly over time, and this PR brings us to the latest set of rules (changed in 2008). - [Disallow the aapcs calling convention on aarch64][rust#88399] This was already not supported by LLVM; this change surfaces this lack of support with a better error message. - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385] - [Warn when an escaped newline skips multiple lines.][rust#87671] - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec` may return different values on glibc <= 2.24.][rust#81825] Rust now invokes the `clone3` system call directly, when available, to use new functionality available via that system call. Older versions of glibc cache the result of `getpid`, and only update that cache when calling glibc's clone/fork functions, so a direct system call bypasses that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason. Internal changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069] This improves the performance of most Rust builds. - [Unify representation of macros in internal data structures.][rust#88019] This change fixes a host of bugs with the handling of macros by the compiler, as well as rustdoc. [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field [rust#87671]: https://github.com/rust-lang/rust/pull/87671 [rust#86183]: https://github.com/rust-lang/rust/pull/86183 [rust#87385]: https://github.com/rust-lang/rust/pull/87385 [rust#88100]: https://github.com/rust-lang/rust/pull/88100 [rust#85305]: https://github.com/rust-lang/rust/pull/85305 [rust#88069]: https://github.com/rust-lang/rust/pull/88069 [rust#87472]: https://github.com/rust-lang/rust/pull/87472 [rust#87699]: https://github.com/rust-lang/rust/pull/87699 [rust#87570]: https://github.com/rust-lang/rust/pull/87570 [rust#88023]: https://github.com/rust-lang/rust/pull/88023 [rust#87760]: https://github.com/rust-lang/rust/pull/87760 [rust#87370]: https://github.com/rust-lang/rust/pull/87370 [rust#87580]: https://github.com/rust-lang/rust/pull/87580 [rust#83342]: https://github.com/rust-lang/rust/pull/83342 [rust#83093]: https://github.com/rust-lang/rust/pull/83093 [rust#85835]: https://github.com/rust-lang/rust/pull/85835 [rust#86744]: https://github.com/rust-lang/rust/pull/86744 [rust#81363]: https://github.com/rust-lang/rust/pull/81363 [rust#84111]: https://github.com/rust-lang/rust/pull/84111 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720 [rust#88399]: https://github.com/rust-lang/rust/pull/88399 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918 [rust#88019]: https://github.com/rust-lang/rust/pull/88019 [rust#87666]: https://github.com/rust-lang/rust/pull/87666 Version 1.55.0 (2021-09-09) ============================ Language -------- - [You can now write open "from" range patterns (`X..`), which will start at `X` and will end at the maximum value of the integer.][83918] - [You can now explicitly import the prelude of different editions through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294] Compiler -------- - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761] These improvements should in general provide faster string parsing of floats, no longer reject certain valid floating point values, and reduce the produced code size for non-stripped artifacts. - [`string::Drain` now implements `AsRef` and `AsRef<[u8]>`.][86858] Stabilised APIs --------------- - [`Bound::cloned`] - [`Drain::as_str`] - [`IntoInnerError::into_error`] - [`IntoInnerError::into_parts`] - [`MaybeUninit::assume_init_mut`] - [`MaybeUninit::assume_init_ref`] - [`MaybeUninit::write`] - [`array::map`] - [`ops::ControlFlow`] - [`x86::_bittest`] - [`x86::_bittestandcomplement`] - [`x86::_bittestandreset`] - [`x86::_bittestandset`] - [`x86_64::_bittest64`] - [`x86_64::_bittestandcomplement64`] - [`x86_64::_bittestandreset64`] - [`x86_64::_bittestandset64`] The following previously stable functions are now `const`. - [`str::from_utf8_unchecked`] Cargo ----- - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking rustc in parallel such as when using `cargo test`.][cargo/9675] - [The package definition in `cargo metadata` now includes the `"default_run"` field from the manifest.][cargo/9550] - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680] - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"` of packages.][cargo/9663] Rustdoc ------- - [Added "Go to item on exact match" search option.][85876] - [The "Implementors" section on traits no longer shows redundant method definitions.][85970] - [Trait implementations are toggled open by default.][86260] This should make the implementations more searchable by tools like `CTRL+F` in your browser. - [Intra-doc links should now correctly resolve associated items (e.g. methods) through type aliases.][86334] - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the "Trait Implementations" section.][86513] Compatibility Notes ------------------- - [std functions that return an `io::Error` will no longer use the `ErrorKind::Other` variant.][85746] This is to better reflect that these kinds of errors could be categorised [into newer more specific `ErrorKind` variants][79965], and that they do not represent a user error. - [Using environment variable names with `process::Command` on Windows now behaves as expected.][85270] Previously using environment variables with `Command` would cause them to be ASCII-uppercased. - [Rustdoc will now warn on using rustdoc lints that aren't prefixed with `rustdoc::`][86849] - `RUSTFLAGS` is no longer set for build scripts. Build scripts should use `CARGO_ENCODED_RUSTFLAGS` instead. See the [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts) for more details. [86849]: https://github.com/rust-lang/rust/pull/86849 [86513]: https://github.com/rust-lang/rust/pull/86513 [86334]: https://github.com/rust-lang/rust/pull/86334 [86260]: https://github.com/rust-lang/rust/pull/86260 [85970]: https://github.com/rust-lang/rust/pull/85970 [85876]: https://github.com/rust-lang/rust/pull/85876 [83572]: https://github.com/rust-lang/rust/pull/83572 [86294]: https://github.com/rust-lang/rust/pull/86294 [86858]: https://github.com/rust-lang/rust/pull/86858 [86761]: https://github.com/rust-lang/rust/pull/86761 [85746]: https://github.com/rust-lang/rust/pull/85746 [85270]: https://github.com/rust-lang/rust/pull/85270 [83918]: https://github.com/rust-lang/rust/pull/83918 [79965]: https://github.com/rust-lang/rust/pull/79965 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html Version 1.54.0 (2021-07-29) ============================ Language ----------------------- - [You can now use macros for values in some built-in attributes.][83366] This primarily allows you to call macros within the `#[doc]` attribute. For example, to include external documentation in your crate, you can now write the following: ```rust #![doc = include_str!("README.md")] ``` - [You can now cast between unsized slice types (and types which contain unsized slices) in `const fn`.][85078] - [You can now use multiple generic lifetimes with `impl Trait` where the lifetimes don't explicitly outlive another.][84701] In code this means that you can now have `impl Trait<'a, 'b>` where as before you could only have `impl Trait<'a, 'b> where 'b: 'a`. Compiler ----------------------- - [Rustc will now search for custom JSON targets in `/lib/rustlib//target.json` where `/` is the "sysroot" directory.][83800] You can find your sysroot directory by running `rustc --print sysroot`. - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072] - [You can now use `#[target_feature]` on safe functions when targeting WebAssembly platforms.][84988] - [Improved debugger output for enums on Windows MSVC platforms.][85292] - [Added tier 3\* support for `bpfel-unknown-none` and `bpfeb-unknown-none`.][79608] - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above. \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries ----------------------- - [`panic::panic_any` will now `#[track_caller]`.][85745] - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744] - [ `proc_macro::Literal` now implements `FromStr`.][84717] - [The implementations of vendor intrinsics in core::arch have been significantly refactored.][83278] The main user-visible changes are a 50% reduction in the size of libcore.rlib and stricter validation of constant operands passed to intrinsics. The latter is technically a breaking change, but allows Rust to more closely match the C vendor intrinsics API. Stabilized APIs --------------- - [`BTreeMap::into_keys`] - [`BTreeMap::into_values`] - [`HashMap::into_keys`] - [`HashMap::into_values`] - [`arch::wasm32`] - [`VecDeque::binary_search`] - [`VecDeque::binary_search_by`] - [`VecDeque::binary_search_by_key`] - [`VecDeque::partition_point`] Cargo ----- - [Added the `--prune ` option to `cargo-tree` to remove a package from the dependency graph.][cargo/9520] - [Added the `--depth` option to `cargo-tree` to print only to a certain depth in the tree ][cargo/9499] - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural macro dependencies.][cargo/9488] - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375] This variable points to a directory that integration tests and benches can use as a "scratchpad" for testing filesystem operations. Compatibility Notes ------------------- - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831] - [Previously unsound code is no longer permitted where different constructors in branches could require different lifetimes.][85574] - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278] than before and may reject some previously accepted code. - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow when compiled with `codegen-units = 1`.][86063] [85574]: https://github.com/rust-lang/rust/issues/85574 [86831]: https://github.com/rust-lang/rust/issues/86831 [86063]: https://github.com/rust-lang/rust/issues/86063 [79608]: https://github.com/rust-lang/rust/pull/79608 [84988]: https://github.com/rust-lang/rust/pull/84988 [84701]: https://github.com/rust-lang/rust/pull/84701 [84072]: https://github.com/rust-lang/rust/pull/84072 [85745]: https://github.com/rust-lang/rust/pull/85745 [84744]: https://github.com/rust-lang/rust/pull/84744 [85078]: https://github.com/rust-lang/rust/pull/85078 [84717]: https://github.com/rust-lang/rust/pull/84717 [83800]: https://github.com/rust-lang/rust/pull/83800 [83366]: https://github.com/rust-lang/rust/pull/83366 [83278]: https://github.com/rust-lang/rust/pull/83278 [85292]: https://github.com/rust-lang/rust/pull/85292 [82834]: https://github.com/rust-lang/rust/pull/82834 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point Version 1.53.0 (2021-06-17) ============================ Language ----------------------- - [You can now use unicode for identifiers.][83799] This allows multilingual identifiers but still doesn't allow glyphs that are not considered characters such as `◆` or `🦀`. More specifically you can now use any identifier that matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This is the same standard as languages like Python, however Rust uses NFC normalization which may be different from other languages. - [You can now specify "or patterns" inside pattern matches.][79278] Previously you could only use `|` (OR) on complete patterns. E.g. ```rust let x = Some(2u8); // Before matches!(x, Some(1) | Some(2)); // Now matches!(x, Some(1 | 2)); ``` - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher has the same semantics as the `:pat` matcher. This is to allow `:pat` to change semantics to being a pattern fragment in a future edition. Compiler ----------------------- - [Updated the minimum external LLVM version to LLVM 10.][83387] - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525] - [Improved debuginfo for closures and async functions on Windows MSVC.][83941] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries ----------------------- - [Abort messages will now forward to `android_set_abort_message` on Android platforms when available.][81469] - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771] - [Arrays of any length now implement `IntoIterator`.][84147] Currently calling `.into_iter()` as a method on an array will return `impl Iterator`, but this may change in a future edition to change `Item` to `T`. Calling `IntoIterator::into_iter` directly on arrays will provide `impl Iterator` as expected. - [`leading_zeros`, and `trailing_zeros` are now available on all `NonZero` integer types.][84082] - [`{f32, f64}::from_str` now parse and print special values (`NaN`, `-0`) according to IEEE 754.][78618] - [You can now index into slices using `(Bound, Bound)`.][77704] - [Add the `BITS` associated constant to all numeric types.][82565] Stabilised APIs --------------- - [`AtomicBool::fetch_update`] - [`AtomicPtr::fetch_update`] - [`BTreeMap::retain`] - [`BTreeSet::retain`] - [`BufReader::seek_relative`] - [`DebugStruct::non_exhaustive`] - [`Duration::MAX`] - [`Duration::ZERO`] - [`Duration::is_zero`] - [`Duration::saturating_add`] - [`Duration::saturating_mul`] - [`Duration::saturating_sub`] - [`ErrorKind::Unsupported`] - [`Option::insert`] - [`Ordering::is_eq`] - [`Ordering::is_ge`] - [`Ordering::is_gt`] - [`Ordering::is_le`] - [`Ordering::is_lt`] - [`Ordering::is_ne`] - [`OsStr::is_ascii`] - [`OsStr::make_ascii_lowercase`] - [`OsStr::make_ascii_uppercase`] - [`OsStr::to_ascii_lowercase`] - [`OsStr::to_ascii_uppercase`] - [`Peekable::peek_mut`] - [`Rc::decrement_strong_count`] - [`Rc::increment_strong_count`] - [`Vec::extend_from_within`] - [`array::from_mut`] - [`array::from_ref`] - [`cmp::max_by_key`] - [`cmp::max_by`] - [`cmp::min_by_key`] - [`cmp::min_by`] - [`f32::is_subnormal`] - [`f64::is_subnormal`] Cargo ----------------------- - [Cargo now supports git repositories where the default `HEAD` branch is not "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format which can handle default branches correctly. - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298] - [The `authors` field is no longer included in `Cargo.toml` for new projects.][cargo/9282] Rustdoc ----------------------- - [Added the `rustdoc::bare_urls` lint that warns when you have URLs without hyperlinks.][81764] Compatibility Notes ------------------- - [Implement token-based handling of attributes during expansion][82608] - [`Ipv4::from_str` will now reject octal format IP addresses in addition to rejecting hexadecimal IP addresses.][83652] The octal format can lead to confusion and potential security vulnerabilities and [is no longer recommended][ietf6943]. - [The added `BITS` constant may conflict with external definitions.][85667] In particular, this was known to be a problem in the `lexical-core` crate, but they have published fixes for semantic versions 0.4 through 0.7. To update this dependency alone, use `cargo update -p lexical-core`. - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1. Internal Only ------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Rework the `std::sys::windows::alloc` implementation.][83065] - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864] - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681] - [Rework rustdoc const type][82873] [85667]: https://github.com/rust-lang/rust/pull/85667 [83386]: https://github.com/rust-lang/rust/pull/83386 [82771]: https://github.com/rust-lang/rust/pull/82771 [84147]: https://github.com/rust-lang/rust/pull/84147 [84082]: https://github.com/rust-lang/rust/pull/84082 [83799]: https://github.com/rust-lang/rust/pull/83799 [83681]: https://github.com/rust-lang/rust/pull/83681 [83652]: https://github.com/rust-lang/rust/pull/83652 [83387]: https://github.com/rust-lang/rust/pull/83387 [82873]: https://github.com/rust-lang/rust/pull/82873 [82864]: https://github.com/rust-lang/rust/pull/82864 [82608]: https://github.com/rust-lang/rust/pull/82608 [82565]: https://github.com/rust-lang/rust/pull/82565 [80525]: https://github.com/rust-lang/rust/pull/80525 [79278]: https://github.com/rust-lang/rust/pull/79278 [78618]: https://github.com/rust-lang/rust/pull/78618 [77704]: https://github.com/rust-lang/rust/pull/77704 [83941]: https://github.com/rust-lang/rust/pull/83941 [83065]: https://github.com/rust-lang/rust/pull/83065 [81764]: https://github.com/rust-lang/rust/pull/81764 [81469]: https://github.com/rust-lang/rust/pull/81469 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.decrement_strong_count [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f32.html#method.is_subnormal [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1 Version 1.52.1 (2021-05-10) ============================ This release disables incremental compilation, unless the user has explicitly opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable. This is due to the widespread, and frequently occurring, breakage encountered by Rust users due to newly enabled incremental verification in 1.52.0. Notably, Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by newly added incremental verification are still present in past stable versions, and are not yet fixed on any channel. These bugs can lead to miscompilation of Rust binaries. These problems only affect incremental builds, so release builds with Cargo should not be affected unless the user has explicitly opted into incremental. Debug and check builds are affected. See [84970] for more details. [84970]: https://github.com/rust-lang/rust/issues/84970 Version 1.52.0 (2021-05-06) ============================ Language -------- - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint is allowed by default, and may become a warning or hard error in a future edition. - [You can now cast mutable references to arrays to a pointer of the same type as the element.][81479] Compiler -------- - [Upgraded the default LLVM to LLVM 12.][81451] Added tier 3\* support for the following targets. - [`s390x-unknown-linux-musl`][82166] - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202] - [`powerpc-unknown-openbsd`][82733] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [`OsString` now implements `Extend` and `FromIterator`.][82121] - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879] - [`Arc` now implements `error::Error`.][80553] - [All integer division and remainder operations are now `const`.][80962] Stabilised APIs ------------- - [`Arguments::as_str`] - [`char::MAX`] - [`char::REPLACEMENT_CHARACTER`] - [`char::UNICODE_VERSION`] - [`char::decode_utf16`] - [`char::from_digit`] - [`char::from_u32_unchecked`] - [`char::from_u32`] - [`slice::partition_point`] - [`str::rsplit_once`] - [`str::split_once`] The following previously stable APIs are now `const`. - [`char::len_utf8`] - [`char::len_utf16`] - [`char::to_ascii_uppercase`] - [`char::to_ascii_lowercase`] - [`char::eq_ignore_ascii_case`] - [`u8::to_ascii_uppercase`] - [`u8::to_ascii_lowercase`] - [`u8::eq_ignore_ascii_case`] Rustdoc ------- - [Rustdoc lints are now treated as a tool lint, meaning that lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527] Using the old style is still allowed, and will become a warning in a future release. - [Rustdoc now supports argument files.][82261] - [Rustdoc now generates smart punctuation for documentation.][79423] - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g. ```markdown - [x] Complete - [ ] Todo ``` Misc ---- - [You can now pass multiple filters to tests.][81356] E.g. `cargo test -- foo bar` will run all tests that match `foo` and `bar`. - [Rustup now distributes PDB symbols for the `std` library on Windows, allowing you to see `std` symbols when debugging.][82218] Internal Only ------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Check the result cache before the DepGraph when ensuring queries][81855] - [Try fast_reject::simplify_type in coherence before doing full check][81744] - [Only store a LocalDefId in some HIR nodes][81611] - [Store HIR attributes in a side table][79519] Compatibility Notes ------------------- - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181] - [Removed support for the `x86_64-rumprun-netbsd` target.][82594] - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216] - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying languages in code blocks.][78429] - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763] - [Changes in how proc macros handle whitespace may lead to panics when used with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136] - [Turn `#[derive]` into a regular macro attribute][79078] [84136]: https://github.com/rust-lang/rust/issues/84136 [80763]: https://github.com/rust-lang/rust/pull/80763 [82166]: https://github.com/rust-lang/rust/pull/82166 [82121]: https://github.com/rust-lang/rust/pull/82121 [81879]: https://github.com/rust-lang/rust/pull/81879 [82261]: https://github.com/rust-lang/rust/pull/82261 [82218]: https://github.com/rust-lang/rust/pull/82218 [82216]: https://github.com/rust-lang/rust/pull/82216 [82202]: https://github.com/rust-lang/rust/pull/82202 [81855]: https://github.com/rust-lang/rust/pull/81855 [81766]: https://github.com/rust-lang/rust/pull/81766 [81744]: https://github.com/rust-lang/rust/pull/81744 [81611]: https://github.com/rust-lang/rust/pull/81611 [81479]: https://github.com/rust-lang/rust/pull/81479 [81451]: https://github.com/rust-lang/rust/pull/81451 [81356]: https://github.com/rust-lang/rust/pull/81356 [80962]: https://github.com/rust-lang/rust/pull/80962 [80553]: https://github.com/rust-lang/rust/pull/80553 [80527]: https://github.com/rust-lang/rust/pull/80527 [79519]: https://github.com/rust-lang/rust/pull/79519 [79423]: https://github.com/rust-lang/rust/pull/79423 [79208]: https://github.com/rust-lang/rust/pull/79208 [78429]: https://github.com/rust-lang/rust/pull/78429 [82733]: https://github.com/rust-lang/rust/pull/82733 [82594]: https://github.com/rust-lang/rust/pull/82594 [79078]: https://github.com/rust-lang/rust/pull/79078 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case Version 1.51.0 (2021-03-25) ============================ Language -------- - [You can now parameterize items such as functions, traits, and `struct`s by constant values in addition to by types and lifetimes.][79135] Also known as "const generics" E.g. you can now write the following. Note: Only values of primitive integers, `bool`, or `char` types are currently permitted. ```rust struct GenericArray { inner: [T; LENGTH] } impl GenericArray { const fn last(&self) -> Option<&T> { if LENGTH == 0 { None } else { Some(&self.inner[LENGTH - 1]) } } } ``` Compiler -------- - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570] This option controls whether debug information is split across multiple files or packed into a single file. **Note** This option is unstable on other platforms. - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`, `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455] - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662] - [The `target-cpu=native` option will now detect individual features of CPUs.][80749] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945] - [`str` now implements `AsMut`.][80279] - [`u64` and `u128` now implement `From`.][79502] - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180] - [`Poll::{map_ok, map_err}` are now implemented for `Poll>>`.][80968] - [`unsigned_abs` is now implemented for all signed integer types.][80959] - [`io::Empty` now implements `io::Seek`.][78044] - [`rc::Weak` and `sync::Weak`'s methods such as `as_ptr` are now implemented for `T: ?Sized` types.][80764] - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134] Stabilized APIs --------------- - [`Arc::decrement_strong_count`] - [`Arc::increment_strong_count`] - [`Once::call_once_force`] - [`Peekable::next_if_eq`] - [`Peekable::next_if`] - [`Seek::stream_position`] - [`array::IntoIter`] - [`panic::panic_any`] - [`ptr::addr_of!`] - [`ptr::addr_of_mut!`] - [`slice::fill_with`] - [`slice::split_inclusive_mut`] - [`slice::split_inclusive`] - [`slice::strip_prefix`] - [`slice::strip_suffix`] - [`str::split_inclusive`] - [`sync::OnceState`] - [`task::Wake`] - [`VecDeque::range`] - [`VecDeque::range_mut`] Cargo ----- - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo codegen option.][cargo/9112] - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try to avoid unifying features of dependencies where that unification could be unwanted. Such as using the same dependency with a `std` feature in a build scripts and proc-macros, while using the `no-std` feature in the final binary. See the [Cargo book documentation][feature-resolver@2.0] for more information on the feature. Rustdoc ------- - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653] - [You can now provide a `--default-theme` flag which sets the default theme to use for documentation.][79642] Various improvements to intra-doc links: - [You can link to non-path primitives such as `slice`.][80181] - [You can link to associated items.][74489] - [You can now include generic parameters when linking to items, like `Vec`.][76934] Misc ---- - [You can now pass `--include-ignored` to tests (e.g. with `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053] Compatibility Notes ------------------- - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998] - [`rustc` no longer promotes division, modulo and indexing operations to `const` that could fail.][80579] - [The minimum version of glibc for the following platforms has been bumped to version 2.31 for the distributed artifacts.][81521] - `armv5te-unknown-linux-gnueabi` - `sparc64-unknown-linux-gnu` - `thumbv7neon-unknown-linux-gnueabihf` - `armv7-unknown-linux-gnueabi` - `x86_64-unknown-linux-gnux32` - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead. Internal Only ------------- - [Consistently avoid constructing optimized MIR when not doing codegen][80718] [79135]: https://github.com/rust-lang/rust/pull/79135 [74489]: https://github.com/rust-lang/rust/pull/74489 [76934]: https://github.com/rust-lang/rust/pull/76934 [79570]: https://github.com/rust-lang/rust/pull/79570 [80181]: https://github.com/rust-lang/rust/pull/80181 [79642]: https://github.com/rust-lang/rust/pull/79642 [80945]: https://github.com/rust-lang/rust/pull/80945 [80279]: https://github.com/rust-lang/rust/pull/80279 [80053]: https://github.com/rust-lang/rust/pull/80053 [79502]: https://github.com/rust-lang/rust/pull/79502 [75180]: https://github.com/rust-lang/rust/pull/75180 [81521]: https://github.com/rust-lang/rust/pull/81521 [80968]: https://github.com/rust-lang/rust/pull/80968 [80959]: https://github.com/rust-lang/rust/pull/80959 [80718]: https://github.com/rust-lang/rust/pull/80718 [80653]: https://github.com/rust-lang/rust/pull/80653 [80579]: https://github.com/rust-lang/rust/pull/80579 [79998]: https://github.com/rust-lang/rust/pull/79998 [78044]: https://github.com/rust-lang/rust/pull/78044 [81455]: https://github.com/rust-lang/rust/pull/81455 [80764]: https://github.com/rust-lang/rust/pull/80764 [80749]: https://github.com/rust-lang/rust/pull/80749 [80662]: https://github.com/rust-lang/rust/pull/80662 [79134]: https://github.com/rust-lang/rust/pull/79134 [80966]: https://github.com/rust-lang/rust/pull/80966 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_suffix [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut Version 1.50.0 (2021-02-11) ============================ Language ----------------------- - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270] This has been technically possible since 1.38.0, as it was unintentionally stabilized. - [Assignments to `ManuallyDrop` union fields are now considered safe.][78068] Compiler ----------------------- - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142] - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484] - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484] - [Dropped support for all cloudabi targets.][78439] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries ----------------------- - [`proc_macro::Punct` now implements `PartialEq`.][78636] - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989] - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699] This value cannot be a valid file descriptor, and now means `Option` takes up the same amount of space as `File`. Stabilized APIs --------------- - [`bool::then`] - [`btree_map::Entry::or_insert_with_key`] - [`f32::clamp`] - [`f64::clamp`] - [`hash_map::Entry::or_insert_with_key`] - [`Ord::clamp`] - [`RefCell::take`] - [`slice::fill`] - [`UnsafeCell::get_mut`] The following previously stable methods are now `const`. - [`IpAddr::is_ipv4`] - [`IpAddr::is_ipv6`] - [`IpAddr::is_unspecified`] - [`IpAddr::is_loopback`] - [`IpAddr::is_multicast`] - [`Ipv4Addr::octets`] - [`Ipv4Addr::is_loopback`] - [`Ipv4Addr::is_private`] - [`Ipv4Addr::is_link_local`] - [`Ipv4Addr::is_multicast`] - [`Ipv4Addr::is_broadcast`] - [`Ipv4Addr::is_documentation`] - [`Ipv4Addr::to_ipv6_compatible`] - [`Ipv4Addr::to_ipv6_mapped`] - [`Ipv6Addr::segments`] - [`Ipv6Addr::is_unspecified`] - [`Ipv6Addr::is_loopback`] - [`Ipv6Addr::is_multicast`] - [`Ipv6Addr::to_ipv4`] - [`Layout::size`] - [`Layout::align`] - [`Layout::from_size_align`] - `pow` for all integer types. - `checked_pow` for all integer types. - `saturating_pow` for all integer types. - `wrapping_pow` for all integer types. - `next_power_of_two` for all unsigned integer types. - `checked_next_power_of_two` for all unsigned integer types. Cargo ----------------------- - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976] This option sets a wrapper to execute instead of `rustc`, for workspace members only. - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire contents of that directory for changes.][cargo/8973] - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725] Misc ---- - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896] - [Running tests will now print the total time taken to execute.][75752] Compatibility Notes ------------------- - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead. - [Changes in how `TokenStream`s are checked have fixed some cases where you could write unhygenic `macro_rules!` macros.][79472] - [`#![test]` as an inner attribute is now considered unstable like other inner macro attributes, and reports an error by default through the `soft_unstable` lint.][79003] - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864] - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's recommended to use the `#[panic_handler]` attribute to provide your own implementation. - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296] [74989]: https://github.com/rust-lang/rust/pull/74989 [79261]: https://github.com/rust-lang/rust/pull/79261 [79896]: https://github.com/rust-lang/rust/pull/79896 [79484]: https://github.com/rust-lang/rust/pull/79484 [79472]: https://github.com/rust-lang/rust/pull/79472 [79270]: https://github.com/rust-lang/rust/pull/79270 [79003]: https://github.com/rust-lang/rust/pull/79003 [78864]: https://github.com/rust-lang/rust/pull/78864 [78636]: https://github.com/rust-lang/rust/pull/78636 [78439]: https://github.com/rust-lang/rust/pull/78439 [78343]: https://github.com/rust-lang/rust/pull/78343 [78296]: https://github.com/rust-lang/rust/pull/78296 [78068]: https://github.com/rust-lang/rust/pull/78068 [75752]: https://github.com/rust-lang/rust/pull/75752 [74699]: https://github.com/rust-lang/rust/pull/74699 [78142]: https://github.com/rust-lang/rust/pull/78142 [77484]: https://github.com/rust-lang/rust/pull/77484 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then [`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp [`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill Version 1.49.0 (2020-12-31) ============================ Language ----------------------- - [Unions can now implement `Drop`, and you can now have a field in a union with `ManuallyDrop`.][77547] - [You can now cast uninhabited enums to integers.][76199] - [You can now bind by reference and by move in patterns.][76119] This allows you to selectively borrow individual components of a type. E.g. ```rust #[derive(Debug)] struct Person { name: String, age: u8, } let person = Person { name: String::from("Alice"), age: 20, }; // `name` is moved out of person, but `age` is referenced. let Person { name, ref age } = person; println!("{} {}", name, age); ``` Compiler ----------------------- - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228] - [Added tier 2 support for `aarch64-apple-darwin`.][75991] - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914] - [Added tier 3 support for `mipsel-unknown-none`.][78676] - [Raised the minimum supported LLVM version to LLVM 9.][78848] - [Output from threads spawned in tests is now captured.][78227] - [Change os and vendor values to "none" and "unknown" for some targets][78951] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries ----------------------- - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109] - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997] Stabilized APIs --------------- - [`slice::select_nth_unstable`] - [`slice::select_nth_unstable_by`] - [`slice::select_nth_unstable_by_key`] The following previously stable methods are now `const`. - [`Poll::is_ready`] - [`Poll::is_pending`] Cargo ----------------------- - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864] - [`cargo-tree` now marks proc-macro crates.][cargo/8765] - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This variable will be set if the crate being built is one the user selected to build, either with `-p` or through defaults. - [You can now use glob patterns when specifying packages & targets.][cargo/8752] Compatibility Notes ------------------- - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746] - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376] - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015] Previously such invalid or unused attributes could be ignored. - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You read [this post about the changes][rustdoc-ws-post] for more details. - [Trait bounds are no longer inferred for associated types.][79904] Internal Only ------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [rustc's internal crates are now compiled using the `initial-exec` Thread Local Storage model.][78201] - [Calculate visibilities once in resolve.][78077] - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703] - [Added `--color` for configuring terminal color support to bootstrap.][79004] [75991]: https://github.com/rust-lang/rust/pull/75991 [78951]: https://github.com/rust-lang/rust/pull/78951 [78848]: https://github.com/rust-lang/rust/pull/78848 [78746]: https://github.com/rust-lang/rust/pull/78746 [78376]: https://github.com/rust-lang/rust/pull/78376 [78228]: https://github.com/rust-lang/rust/pull/78228 [78227]: https://github.com/rust-lang/rust/pull/78227 [78201]: https://github.com/rust-lang/rust/pull/78201 [78109]: https://github.com/rust-lang/rust/pull/78109 [78077]: https://github.com/rust-lang/rust/pull/78077 [77997]: https://github.com/rust-lang/rust/pull/77997 [77703]: https://github.com/rust-lang/rust/pull/77703 [77547]: https://github.com/rust-lang/rust/pull/77547 [77015]: https://github.com/rust-lang/rust/pull/77015 [76199]: https://github.com/rust-lang/rust/pull/76199 [76119]: https://github.com/rust-lang/rust/pull/76119 [75914]: https://github.com/rust-lang/rust/pull/75914 [79004]: https://github.com/rust-lang/rust/pull/79004 [78676]: https://github.com/rust-lang/rust/pull/78676 [79904]: https://github.com/rust-lang/rust/issues/79904 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc Version 1.48.0 (2020-11-19) ========================== Language -------- - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This is still rejected *semantically*, but can now be parsed by procedural macros. Compiler -------- - [Stabilised the `-C link-self-contained=` compiler flag.][76158] This tells `rustc` whether to link its own C runtime and libraries or to rely on a external linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.) - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386] Note: If you're using cargo you must explicitly pass the `--target` flag. - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`, and `&Stderr`.][76275] - [All arrays of any length now implement `TryFrom>`.][76310] - [The `matches!` macro now supports having a trailing comma.][74880] - [`Vec` now implements `PartialEq<[B]>` where `A: PartialEq`.][74194] - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055] Stabilized APIs --------------- - [`slice::as_ptr_range`] - [`slice::as_mut_ptr_range`] - [`VecDeque::make_contiguous`] - [`future::pending`] - [`future::ready`] The following previously stable methods are now `const fn`'s: - [`Option::is_some`] - [`Option::is_none`] - [`Option::as_ref`] - [`Result::is_ok`] - [`Result::is_err`] - [`Result::as_ref`] - [`Ordering::reverse`] - [`Ordering::then`] Cargo ----- Rustdoc ------- - [You can now link to items in `rustdoc` using the intra-doc link syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate a link to `std::future`'s documentation. See ["Linking to items by name"][intradoc-links] for more information. - [You can now specify `#[doc(alias = "")]` on items to add search aliases when searching through `rustdoc`'s UI.][75740] Compatibility Notes ------------------- - [Promotion of references to `'static` lifetime inside `const fn` now follows the same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be promoted to `'static` lifetime any more inside `const fn`s. - [Associated type bindings on trait objects are now verified to meet the bounds declared on the trait when checking that they implement the trait.][27675] - [When trait bounds on associated types or opaque types are ambiguous, the compiler no longer makes an arbitrary choice on which bound to use.][54121] - [Fixed recursive nonterminals not being expanded in macros during pretty-print/reparse check.][77153] This may cause errors if your macro wasn't correctly handling recursive nonterminal tokens. - [`&mut` references to non zero-sized types are no longer promoted.][75585] - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]` in places where they have no effect.][73461] - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166] - [`mem::uninitialized` will now panic if any inner types inside a struct or enum disallow zero-initialization.][71274] - [`#[target_feature]` will now error if used in a place where it has no effect.][78143] - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212] Note: This behaviour is not guaranteed and is still considered undefined behaviour, see the [`catch_unwind`] documentation for further information. Internal Only ------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Building `rustc` from source now uses `ninja` by default over `make`.][74922] You can continue building with `make` by setting `ninja=false` in your `config.toml`. - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030] - [Made `ensure_sufficient_stack()` non-generic][76680] [78143]: https://github.com/rust-lang/rust/issues/78143 [76680]: https://github.com/rust-lang/rust/pull/76680/ [76030]: https://github.com/rust-lang/rust/pull/76030/ [70212]: https://github.com/rust-lang/rust/pull/70212/ [27675]: https://github.com/rust-lang/rust/issues/27675/ [54121]: https://github.com/rust-lang/rust/issues/54121/ [71274]: https://github.com/rust-lang/rust/pull/71274/ [77386]: https://github.com/rust-lang/rust/pull/77386/ [77153]: https://github.com/rust-lang/rust/pull/77153/ [77055]: https://github.com/rust-lang/rust/pull/77055/ [76275]: https://github.com/rust-lang/rust/pull/76275/ [76310]: https://github.com/rust-lang/rust/pull/76310/ [76420]: https://github.com/rust-lang/rust/pull/76420/ [76158]: https://github.com/rust-lang/rust/pull/76158/ [75857]: https://github.com/rust-lang/rust/pull/75857/ [75585]: https://github.com/rust-lang/rust/pull/75585/ [75740]: https://github.com/rust-lang/rust/pull/75740/ [75502]: https://github.com/rust-lang/rust/pull/75502/ [74880]: https://github.com/rust-lang/rust/pull/74880/ [74922]: https://github.com/rust-lang/rust/pull/74922/ [74430]: https://github.com/rust-lang/rust/pull/74430/ [74194]: https://github.com/rust-lang/rust/pull/74194/ [73461]: https://github.com/rust-lang/rust/pull/73461/ [73166]: https://github.com/rust-lang/rust/pull/73166/ [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html Version 1.47.0 (2020-10-08) ========================== Language -------- - [Closures will now warn when not used.][74869] Compiler -------- - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other platforms. - [Upgraded to LLVM 11.][73526] - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419] - [Upgrade the FreeBSD toolchain to version 11.4][75204] - [`RUST_BACKTRACE`'s output is now more compact.][75048] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [`CStr` now implements `Index>`.][74021] - [Traits in `std`/`core` are now implemented for arrays of any length, not just those of length less than 33.][74060] - [`ops::RangeFull` and `ops::Range` now implement Default.][73197] - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`, `PartialEq`, and `PartialOrd`.][73583] Stabilized APIs --------------- - [`Ident::new_raw`] - [`Range::is_empty`] - [`RangeInclusive::is_empty`] - [`Result::as_deref`] - [`Result::as_deref_mut`] - [`Vec::leak`] - [`pointer::offset_from`] - [`f32::TAU`] - [`f64::TAU`] The following previously stable APIs have now been made const. - [The `new` method for all `NonZero` integers.][73858] - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`, `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul` methods for all integers.][73858] - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all signed integers.][73858] - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`, `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`, `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and `is_ascii_control` methods for `char` and `u8`.][73858] Cargo ----- - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500] You can override this by setting the following in your `Cargo.toml`. ```toml [profile.release.build-override] opt-level = 3 ``` - [`cargo-help` will now display man pages for commands rather just the `--help` text.][cargo/8456] - [`cargo-metadata` now emits a `test` field indicating if a target has tests enabled.][cargo/8478] - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485] - [`cargo-publish` will now use an alternative registry by default if it's the only registry specified in `package.publish`.][cargo/8571] Misc ---- - [Added a help button beside Rustdoc's searchbar that explains rustdoc's type based search.][75366] - [Added the Ayu theme to rustdoc.][71237] Compatibility Notes ------------------- - [Bumped the minimum supported Emscripten version to 1.39.20.][75716] - [Fixed a regression parsing `{} && false` in tail expressions.][74650] - [Added changes to how proc-macros are expanded in `macro_rules!` that should help to preserve more span information.][73084] These changes may cause compilation errors if your macro was unhygenic or didn't correctly handle `Delimiter::None`. - [Moved support for the CloudABI target to tier 3.][75568] - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163] - [Added the `rustc-docs` component.][75560] This allows you to install and read the documentation for the compiler internal APIs. (Currently only available for `x86_64-unknown-linux-gnu`.) Internal Only -------- - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog. [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard [75048]: https://github.com/rust-lang/rust/pull/75048/ [74163]: https://github.com/rust-lang/rust/pull/74163/ [71237]: https://github.com/rust-lang/rust/pull/71237/ [74869]: https://github.com/rust-lang/rust/pull/74869/ [73858]: https://github.com/rust-lang/rust/pull/73858/ [75716]: https://github.com/rust-lang/rust/pull/75716/ [75560]: https://github.com/rust-lang/rust/pull/75560/ [75568]: https://github.com/rust-lang/rust/pull/75568/ [75366]: https://github.com/rust-lang/rust/pull/75366/ [75204]: https://github.com/rust-lang/rust/pull/75204/ [74650]: https://github.com/rust-lang/rust/pull/74650/ [74419]: https://github.com/rust-lang/rust/pull/74419/ [73964]: https://github.com/rust-lang/rust/pull/73964/ [74021]: https://github.com/rust-lang/rust/pull/74021/ [74060]: https://github.com/rust-lang/rust/pull/74060/ [73893]: https://github.com/rust-lang/rust/pull/73893/ [73526]: https://github.com/rust-lang/rust/pull/73526/ [73583]: https://github.com/rust-lang/rust/pull/73583/ [73084]: https://github.com/rust-lang/rust/pull/73084/ [73197]: https://github.com/rust-lang/rust/pull/73197/ [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/ [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/ [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/ [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/ [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/ [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from Version 1.46.0 (2020-08-27) ========================== Language -------- - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437] - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in const functions.][73862] - [The `#[track_caller]` attribute can now be added to functions to use the function's caller's location information for panic messages.][72445] - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g. `x.0.0` over `(x.0).0`. - [`mem::transmute` can now be used in statics and constants.][72920] **Note** You currently can't use `mem::transmute` in constant functions. Compiler -------- - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516] - [Enabled static "Position Independent Executables" by default for `x86_64-unknown-linux-musl`.][70740] Libraries --------- - [`mem::forget` is now a `const fn`.][73887] - [`String` now implements `From`.][73466] - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all integer types.][73032] - [`vec::IntoIter` now implements `AsRef<[T]>`.][72583] - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their zero-able equivalent (e.g. `TryFrom`).][72717] - [`&[T]` and `&mut [T]` now implement `PartialEq>`.][71660] - [`(String, u16)` now implements `ToSocketAddrs`.][73007] - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584] Stabilized APIs --------------- - [`Option::zip`] - [`vec::Drain::as_slice`] Cargo ----- Added a number of new environment variables that are now available when compiling your crate. - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of the specific binary being compiled and the name of the crate. - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package. - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file. Compatibility Notes ------------------- - [The target configuration option `abi_blacklist` has been renamed to `unsupported_abis`.][74150] The old name will still continue to work. - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331] This was previously accepted but will become a hard error in a future release. - [Rustc will fail to compile if you have a struct with `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only allowed on `enum`s. - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps ensure that spans have the correct information, and may cause breakage if you were relying on receiving spans with dummy information. - [The InnoSetup installer for Windows is no longer available.][72569] This was a legacy installer that was replaced by a MSI installer a few years ago but was still being built. - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486] - [Rustc will no longer accept overlapping trait implementations that only differ in how the lifetime was bound.][72493] - [Rustc now correctly relates the lifetime of an existential associated type.][71896] This fixes some edge cases where `rustc` would erroneously allow you to pass a shorter lifetime than expected. - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420] The library will need to be installed for `rustc` to work, even though we expect it to be already available on most systems. - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running under QEMU.][74820] - [Pretty printing of some tokens in procedural macros changed.][75453] The exact output returned by rustc's pretty printing is an unstable implementation detail: we recommend any macro relying on it to switch to a more robust parsing system. [75453]: https://github.com/rust-lang/rust/issues/75453/ [74820]: https://github.com/rust-lang/rust/issues/74820/ [74420]: https://github.com/rust-lang/rust/issues/74420/ [74109]: https://github.com/rust-lang/rust/pull/74109/ [74150]: https://github.com/rust-lang/rust/pull/74150/ [73862]: https://github.com/rust-lang/rust/pull/73862/ [73887]: https://github.com/rust-lang/rust/pull/73887/ [73466]: https://github.com/rust-lang/rust/pull/73466/ [73516]: https://github.com/rust-lang/rust/pull/73516/ [73293]: https://github.com/rust-lang/rust/pull/73293/ [73007]: https://github.com/rust-lang/rust/pull/73007/ [73032]: https://github.com/rust-lang/rust/pull/73032/ [72920]: https://github.com/rust-lang/rust/pull/72920/ [72569]: https://github.com/rust-lang/rust/pull/72569/ [72583]: https://github.com/rust-lang/rust/pull/72583/ [72584]: https://github.com/rust-lang/rust/pull/72584/ [72717]: https://github.com/rust-lang/rust/pull/72717/ [72437]: https://github.com/rust-lang/rust/pull/72437/ [72445]: https://github.com/rust-lang/rust/pull/72445/ [72486]: https://github.com/rust-lang/rust/pull/72486/ [72493]: https://github.com/rust-lang/rust/pull/72493/ [72331]: https://github.com/rust-lang/rust/pull/72331/ [71896]: https://github.com/rust-lang/rust/pull/71896/ [71660]: https://github.com/rust-lang/rust/pull/71660/ [71322]: https://github.com/rust-lang/rust/pull/71322/ [70740]: https://github.com/rust-lang/rust/pull/70740/ [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/ [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/ [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/ [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice Version 1.45.2 (2020-08-03) ========================== * [Fix bindings in tuple struct patterns][74954] * [Fix track_caller integration with trait objects][74784] [74954]: https://github.com/rust-lang/rust/issues/74954 [74784]: https://github.com/rust-lang/rust/issues/74784 Version 1.45.1 (2020-07-30) ========================== * [Fix const propagation with references.][73613] * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078] * [Avoid spurious implicit region bound.][74509] * [Install clippy on x.py install][74457] [73613]: https://github.com/rust-lang/rust/pull/73613 [73078]: https://github.com/rust-lang/rust/issues/73078 [74509]: https://github.com/rust-lang/rust/pull/74509 [74457]: https://github.com/rust-lang/rust/pull/74457 Version 1.45.0 (2020-07-16) ========================== Language -------- - [Out of range float to int conversions using `as` has been defined as a saturating conversion.][71269] This was previously undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which may be desirable in rare performance sensitive situations. - [`mem::Discriminant` now uses `T`'s discriminant type instead of always using `u64`.][70705] - [Function like procedural macros can now be used in expression, pattern, and statement positions.][68717] This means you can now use a function-like procedural macro anywhere you can use a declarative (`macro_rules!`) macro. Compiler -------- - [You can now override individual target features through the `target-feature` flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now equivalent to `-C target-feature=+avx2,+fma`. - [Added the `force-unwind-tables` flag.][69984] This option allows rustc to always generate unwind tables regardless of panic strategy. - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc to include LLVM bitcode into generated `rlib`s (this is on by default). - [Added the `tiny` value to the `code-model` codegen flag.][72397] - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062] - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133] - [Upgraded to LLVM 10.][67759] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd` and `Ord`.][72239] - [`proc_macro::TokenStream` now implements `Default`.][72234] - [You can now use `char` with `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over a range of codepoints.][72413] E.g. you can now write the following; ```rust for ch in 'a'..='z' { print!("{}", ch); } println!(); // Prints "abcdefghijklmnopqrstuvwxyz" ``` - [`OsString` now implements `FromStr`.][71662] - [The `saturating_neg` method has been added to all signed integer primitive types, and the `saturating_abs` method has been added for all integer primitive types.][71886] - [`Arc`, `Rc` now implement `From>`, and `Box` now implements `From` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`, or `Path`.][71447] - [`Box<[T]>` now implements `From<[T; N]>`.][71095] - [`BitOr` and `BitOrAssign` are implemented for all `NonZero` integer types.][69813] - [The `fetch_min`, and `fetch_max` methods have been added to all atomic integer types.][72324] - [The `fetch_update` method has been added to all atomic integer types.][71843] Stabilized APIs --------------- - [`Arc::as_ptr`] - [`BTreeMap::remove_entry`] - [`Rc::as_ptr`] - [`rc::Weak::as_ptr`] - [`rc::Weak::from_raw`] - [`rc::Weak::into_raw`] - [`str::strip_prefix`] - [`str::strip_suffix`] - [`sync::Weak::as_ptr`] - [`sync::Weak::from_raw`] - [`sync::Weak::into_raw`] - [`char::UNICODE_VERSION`] - [`Span::resolved_at`] - [`Span::located_at`] - [`Span::mixed_site`] - [`unix::process::CommandExt::arg0`] Cargo ----- - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build time.][cargo/8066] Misc ---- - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g. `~~outdated information~~` becomes "~~outdated information~~". - [Added an emoji to Rustdoc's deprecated API message.][72014] Compatibility Notes ------------------- - [Trying to self initialize a static value (that is creating a value using itself) is unsound and now causes a compile error.][71140] - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420] This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses. - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were previously undocumented and not intended for public use. Rustdoc still provides a non-zero exit code on errors. - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848] This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc` flags while cargo is adding `embed-bitcode` itself. The recommended way to control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`, or by setting `CARGO_PROFILE__LTO` in the environment. Internals Only -------------- - [Make clippy a git subtree instead of a git submodule][70655] - [Unify the undo log of all snapshot types][69464] [71848]: https://github.com/rust-lang/rust/issues/71848/ [73420]: https://github.com/rust-lang/rust/issues/73420/ [72324]: https://github.com/rust-lang/rust/pull/72324/ [71843]: https://github.com/rust-lang/rust/pull/71843/ [71886]: https://github.com/rust-lang/rust/pull/71886/ [72234]: https://github.com/rust-lang/rust/pull/72234/ [72239]: https://github.com/rust-lang/rust/pull/72239/ [72397]: https://github.com/rust-lang/rust/pull/72397/ [72413]: https://github.com/rust-lang/rust/pull/72413/ [72014]: https://github.com/rust-lang/rust/pull/72014/ [72062]: https://github.com/rust-lang/rust/pull/72062/ [72094]: https://github.com/rust-lang/rust/pull/72094/ [72133]: https://github.com/rust-lang/rust/pull/72133/ [67759]: https://github.com/rust-lang/rust/pull/67759/ [71900]: https://github.com/rust-lang/rust/pull/71900/ [71928]: https://github.com/rust-lang/rust/pull/71928/ [71662]: https://github.com/rust-lang/rust/pull/71662/ [71716]: https://github.com/rust-lang/rust/pull/71716/ [71447]: https://github.com/rust-lang/rust/pull/71447/ [71269]: https://github.com/rust-lang/rust/pull/71269/ [71095]: https://github.com/rust-lang/rust/pull/71095/ [71140]: https://github.com/rust-lang/rust/pull/71140/ [70655]: https://github.com/rust-lang/rust/pull/70655/ [70705]: https://github.com/rust-lang/rust/pull/70705/ [69984]: https://github.com/rust-lang/rust/pull/69984/ [69813]: https://github.com/rust-lang/rust/pull/69813/ [69464]: https://github.com/rust-lang/rust/pull/69464/ [68717]: https://github.com/rust-lang/rust/pull/68717/ [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0 Version 1.44.1 (2020-06-18) =========================== * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078] * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329] * [Fix crashes when finding backtrace on macOS.][71397] * [Clippy applies lint levels into different files.][clippy/5356] [71397]: https://github.com/rust-lang/rust/issues/71397 [73078]: https://github.com/rust-lang/rust/issues/73078 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356 Version 1.44.0 (2020-06-04) ========================== Language -------- - [You can now use `async/.await` with `#[no_std]` enabled.][69033] - [Added the `unused_braces` lint.][70081] **Syntax-only changes** - [Expansion-driven outline module parsing][69838] ```rust #[cfg(FALSE)] mod foo { mod bar { mod baz; // `foo/bar/baz.rs` doesn't exist, but no error! } } ``` These are still rejected semantically, so you will likely receive an error but these changes can be seen and parsed by macros and conditional compilation. Compiler -------- - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156] Additionally when in incremental mode rustc defaults to 256 codegen units. - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and a panic is thrown.][67502] - [Added tier 3\* support for the `aarch64-unknown-none` and `aarch64-unknown-none-softfloat` targets.][68334] - [Added tier 3 support for `arm64-apple-tvos` and `x86_64-apple-tvos` targets.][68191] Libraries --------- - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows `vec![]` to be able to be used in `const` contexts. - [`convert::Infallible` now implements `Hash`.][70281] - [`OsString` now implements `DerefMut` and `IndexMut` returning a `&mut OsStr`.][70048] - [Unicode 13 is now supported.][69929] - [`String` now implements `From<&mut str>`.][69661] - [`IoSlice` now implements `Copy`.][69403] - [`Vec` now implements `From<[T; N]>`.][68692] Where `N` is at most 32. - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899] - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`, `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all integer types.][69373] Stabilized APIs --------------- - [`PathBuf::with_capacity`] - [`PathBuf::capacity`] - [`PathBuf::clear`] - [`PathBuf::reserve`] - [`PathBuf::reserve_exact`] - [`PathBuf::shrink_to_fit`] - [`f32::to_int_unchecked`] - [`f64::to_int_unchecked`] - [`Layout::align_to`] - [`Layout::pad_to_align`] - [`Layout::array`] - [`Layout::extend`] Cargo ----- - [Added the `cargo tree` command which will print a tree graph of your dependencies.][cargo/8062] E.g. ``` mdbook v0.3.2 (/Users/src/rust/mdbook) ├── ammonia v3.0.0 │ ├── html5ever v0.24.0 │ │ ├── log v0.4.8 │ │ │ └── cfg-if v0.1.9 │ │ ├── mac v0.1.1 │ │ └── markup5ever v0.9.0 │ │ ├── log v0.4.8 (*) │ │ ├── phf v0.7.24 │ │ │ └── phf_shared v0.7.24 │ │ │ ├── siphasher v0.2.3 │ │ │ └── unicase v1.4.2 │ │ │ [build-dependencies] │ │ │ └── version_check v0.1.5 ... ``` You can also display dependencies on multiple versions of the same crate with `cargo tree -d` (short for `cargo tree --duplicates`). Misc ---- - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include the version in the sidebar.][69494] Compatibility Notes ------------------- - [Rustc now correctly generates static libraries on Windows GNU targets with the `.a` extension, rather than the previous `.lib`.][70937] - [Removed the `-C no_integrated_as` flag from rustc.][70345] - [The `file_name` property in JSON output of macro errors now points the actual source file rather than the previous format of ``.][70969] **Note:** this may not point to a file that actually exists on the user's system. - [The minimum required external LLVM version has been bumped to LLVM 8.][71147] - [`mem::{zeroed, uninitialised}` will now panic when used with types that do not allow zero initialization such as `NonZeroU8`.][66059] This was previously a warning. - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as` operator has been defined as a saturating operation.][71269] This was previously undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which may be desirable in rare performance sensitive situations. Internal Only ------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [dep_graph Avoid allocating a set on when the number reads are small.][69778] - [Replace big JS dict with JSON parsing.][71250] [69373]: https://github.com/rust-lang/rust/pull/69373/ [66059]: https://github.com/rust-lang/rust/pull/66059/ [68191]: https://github.com/rust-lang/rust/pull/68191/ [68899]: https://github.com/rust-lang/rust/pull/68899/ [71147]: https://github.com/rust-lang/rust/pull/71147/ [71250]: https://github.com/rust-lang/rust/pull/71250/ [70937]: https://github.com/rust-lang/rust/pull/70937/ [70969]: https://github.com/rust-lang/rust/pull/70969/ [70632]: https://github.com/rust-lang/rust/pull/70632/ [70281]: https://github.com/rust-lang/rust/pull/70281/ [70345]: https://github.com/rust-lang/rust/pull/70345/ [70048]: https://github.com/rust-lang/rust/pull/70048/ [70081]: https://github.com/rust-lang/rust/pull/70081/ [70156]: https://github.com/rust-lang/rust/pull/70156/ [71269]: https://github.com/rust-lang/rust/pull/71269/ [69838]: https://github.com/rust-lang/rust/pull/69838/ [69929]: https://github.com/rust-lang/rust/pull/69929/ [69661]: https://github.com/rust-lang/rust/pull/69661/ [69778]: https://github.com/rust-lang/rust/pull/69778/ [69494]: https://github.com/rust-lang/rust/pull/69494/ [69403]: https://github.com/rust-lang/rust/pull/69403/ [69033]: https://github.com/rust-lang/rust/pull/69033/ [68692]: https://github.com/rust-lang/rust/pull/68692/ [68334]: https://github.com/rust-lang/rust/pull/68334/ [67502]: https://github.com/rust-lang/rust/pull/67502/ [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/ [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend Version 1.43.1 (2020-05-07) =========================== * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430] * [Fixed the stabilization of AVX-512 features.][71473] * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151] [71430]: https://github.com/rust-lang/rust/pull/71430 [71473]: https://github.com/rust-lang/rust/issues/71473 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151 Version 1.43.0 (2020-04-23) ========================== Language -------- - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having the type inferred correctly.][68129] - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201] **Syntax only changes** - [Allow `type Foo: Ord` syntactically.][69361] - [Fuse associated and extern items up to defaultness.][69194] - [Syntactically allow `self` in all `fn` contexts.][68764] - [Merge `fn` syntax + cleanup item parsing.][68728] - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366] For example, you may now write: ```rust macro_rules! mac_trait { ($i:item) => { trait T { $i } } } mac_trait! { fn foo() {} } ``` These are still rejected *semantically*, so you will likely receive an error but these changes can be seen and parsed by macros and conditional compilation. Compiler -------- - [You can now pass multiple lint flags to rustc to override the previous flags.][67885] For example; `rustc -D unused -A unused-variables` denies everything in the `unused` lint group except `unused-variables` which is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies everything in the `unused` lint group **including** `unused-variables` since the allow flag is specified before the deny flag (and therefore overridden). - [rustc will now prefer your system MinGW libraries over its bundled libraries if they are available on `windows-gnu`.][67429] - [rustc now buffers errors/warnings printed in JSON.][69227] Libraries --------- - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement `TryFrom>`,`TryFrom>`, and `TryFrom>` respectively.][69538] **Note** These conversions are only available when `N` is `0..=32`. - [You can now use associated constants on floats and integers directly, rather than having to import the module.][68952] e.g. You can now write `u32::MAX` or `f32::NAN` with no imports. - [`u8::is_ascii` is now `const`.][68984] - [`String` now implements `AsMut`.][68742] - [Added the `primitive` module to `std` and `core`.][67637] This module reexports Rust's primitive types. This is mainly useful in macros where you want avoid these types being shadowed. - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642] - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738] Stabilized APIs --------------- - [`Once::is_completed`] - [`f32::LOG10_2`] - [`f32::LOG2_10`] - [`f64::LOG10_2`] - [`f64::LOG2_10`] - [`iter::once_with`] Cargo ----- - [You can now set config `[profile]`s in your `.cargo/config`, or through your environment.][cargo/7823] - [Cargo will now set `CARGO_BIN_EXE_` pointing to a binary's executable path when running integration tests or benchmarks.][cargo/7697] `` is the name of your binary as-is e.g. If you wanted the executable path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`. Misc ---- - [Certain checks in the `const_err` lint were deemed unrelated to const evaluation][69185], and have been moved to the `unconditional_panic` and `arithmetic_overflow` lints. Compatibility Notes ------------------- - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This has been a warning since 1.36.0. - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly led to some instances being accepted, and now correctly emits a hard error. [69340]: https://github.com/rust-lang/rust/pull/69340 Internal Only ------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of `rustc` and related tools. - [All components are now built with `opt-level=3` instead of `2`.][67878] - [Improved how rustc generates drop code.][67332] - [Improved performance from `#[inline]`-ing certain hot functions.][69256] - [traits: preallocate 2 Vecs of known initial size][69022] - [Avoid exponential behaviour when relating types][68772] - [Skip `Drop` terminators for enum variants without drop glue][68943] - [Improve performance of coherence checks][68966] - [Deduplicate types in the generator witness][68672] - [Invert control in struct_lint_level.][68725] [67332]: https://github.com/rust-lang/rust/pull/67332/ [67429]: https://github.com/rust-lang/rust/pull/67429/ [67637]: https://github.com/rust-lang/rust/pull/67637/ [67642]: https://github.com/rust-lang/rust/pull/67642/ [67878]: https://github.com/rust-lang/rust/pull/67878/ [67885]: https://github.com/rust-lang/rust/pull/67885/ [68129]: https://github.com/rust-lang/rust/pull/68129/ [68672]: https://github.com/rust-lang/rust/pull/68672/ [68725]: https://github.com/rust-lang/rust/pull/68725/ [68728]: https://github.com/rust-lang/rust/pull/68728/ [68738]: https://github.com/rust-lang/rust/pull/68738/ [68742]: https://github.com/rust-lang/rust/pull/68742/ [68764]: https://github.com/rust-lang/rust/pull/68764/ [68772]: https://github.com/rust-lang/rust/pull/68772/ [68943]: https://github.com/rust-lang/rust/pull/68943/ [68952]: https://github.com/rust-lang/rust/pull/68952/ [68966]: https://github.com/rust-lang/rust/pull/68966/ [68984]: https://github.com/rust-lang/rust/pull/68984/ [69022]: https://github.com/rust-lang/rust/pull/69022/ [69185]: https://github.com/rust-lang/rust/pull/69185/ [69194]: https://github.com/rust-lang/rust/pull/69194/ [69201]: https://github.com/rust-lang/rust/pull/69201/ [69227]: https://github.com/rust-lang/rust/pull/69227/ [69548]: https://github.com/rust-lang/rust/pull/69548/ [69256]: https://github.com/rust-lang/rust/pull/69256/ [69361]: https://github.com/rust-lang/rust/pull/69361/ [69366]: https://github.com/rust-lang/rust/pull/69366/ [69538]: https://github.com/rust-lang/rust/pull/69538/ [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html Version 1.42.0 (2020-03-12) ========================== Language -------- - [You can now use the slice pattern syntax with subslices.][67712] e.g. ```rust fn foo(words: &[&str]) { match words { ["Hello", "World", "!", ..] => println!("Hello World!"), ["Foo", "Bar", ..] => println!("Baz"), rest => println!("{:?}", rest), } } ``` - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning that you can create an enum that has the exact layout and ABI of the type it contains. - [You can now use outer attribute procedural macros on inline modules.][64273] - [There are some *syntax-only* changes:][67131] - `default` is syntactically allowed before items in `trait` definitions. - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically leave out their bodies in favor of `;`. - Bounds on associated types in `impl`s are now syntactically allowed (e.g. `type Foo: Ord;`). - `...` (the C-variadic type) may occur syntactically directly as the type of any function parameter. These are still rejected *semantically*, so you will likely receive an error but these changes can be seen and parsed by procedural macros and conditional compilation. Compiler -------- - [Added tier 2\* support for `armv7a-none-eabi`.][68253] - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339] - [`Option::{expect,unwrap}` and `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages pointing to the location where they were called, rather than `core`'s internals. ][67887] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [`iter::Empty` now implements `Send` and `Sync` for any `T`.][68348] - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type to implement `Sized`.][67935] - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233] - [`Layout::new` is now `const`.][66254] - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899] Stabilized APIs --------------- - [`CondVar::wait_while`] - [`CondVar::wait_timeout_while`] - [`DebugMap::key`] - [`DebugMap::value`] - [`ManuallyDrop::take`] - [`matches!`] - [`ptr::slice_from_raw_parts_mut`] - [`ptr::slice_from_raw_parts`] Cargo ----- - [You no longer need to include `extern crate proc_macro;` to be able to `use proc_macro;` in the `2018` edition.][cargo/7700] Compatibility Notes ------------------- - [`Error::description` has been deprecated, and its use will now produce a warning.][66919] It's recommended to use `Display`/`to_string` instead. [68253]: https://github.com/rust-lang/rust/pull/68253/ [68348]: https://github.com/rust-lang/rust/pull/68348/ [67935]: https://github.com/rust-lang/rust/pull/67935/ [68339]: https://github.com/rust-lang/rust/pull/68339/ [68122]: https://github.com/rust-lang/rust/pull/68122/ [64273]: https://github.com/rust-lang/rust/pull/64273/ [67712]: https://github.com/rust-lang/rust/pull/67712/ [67887]: https://github.com/rust-lang/rust/pull/67887/ [67131]: https://github.com/rust-lang/rust/pull/67131/ [67233]: https://github.com/rust-lang/rust/pull/67233/ [66899]: https://github.com/rust-lang/rust/pull/66899/ [66919]: https://github.com/rust-lang/rust/pull/66919/ [66254]: https://github.com/rust-lang/rust/pull/66254/ [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while Version 1.41.1 (2020-02-27) =========================== * [Always check types of static items][69145] * [Always check lifetime bounds of `Copy` impls][69145] * [Fix miscompilation in callers of `Layout::repeat`][69225] * [Rust 1.41.0 was announced as the last Rust release with tier 1 or tier 2 support for 32-bit Apple targets][apple-32bit-drop]. That announcement did not expect a patch release. 1.41.1 also includes release binaries for these targets. [69225]: https://github.com/rust-lang/rust/issues/69225 [69145]: https://github.com/rust-lang/rust/pull/69145 Version 1.41.0 (2020-01-30) =========================== Language -------- - [You can now pass type parameters to foreign items when implementing traits.][65879] E.g. You can now write `impl From for Vec {}`. - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can now write `fn foo(self: Box>) {}`. Previously only `Self`, `&Self`, `&mut Self`, `Arc`, `Rc`, and `Box` were allowed. - [You can now use any valid identifier in a `format_args` macro.][66847] Previously identifiers starting with an underscore were not allowed. - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and enum variants.][66183] These are still rejected semantically, but can be seen and parsed by procedural macros and conditional compilation. - [You can now define a Rust `extern "C"` function with `Box` and use `T*` as the corresponding type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information, including the important caveat about preferring to avoid `Box` in Rust signatures for functions defined in C. [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout Compiler -------- - [Rustc will now warn if you have unused loop `'label`s.][66325] - [Removed support for the `i686-unknown-dragonfly` target.][67255] - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661] - [You can now pass an arguments file passing the `@path` syntax to rustc.][66172] Note that the format differs somewhat from what is found in other tooling; please see [the documentation][argfile-docs] for more information. - [You can now provide `--extern` flag without a path, indicating that it is available from the search path or specified with an `-L` flag.][64882] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path Libraries --------- - [The `core::panic` module is now stable.][66771] It was already stable through `std`. - [`NonZero*` numerics now implement `From` if it's a smaller integer width.][66277] E.g. `NonZeroU16` now implements `From`. - [`MaybeUninit` now implements `fmt::Debug`.][65013] Stabilized APIs --------------- - [`Result::map_or`] - [`Result::map_or_else`] - [`std::rc::Weak::weak_count`] - [`std::rc::Weak::strong_count`] - [`std::sync::Weak::weak_count`] - [`std::sync::Weak::strong_count`] Cargo ----- - [Cargo will now document all the private items for binary crates by default.][cargo/7593] - [`cargo-install` will now reinstall the package if it detects that it is out of date.][cargo/7560] - [Cargo.lock now uses a more git friendly format that should help to reduce merge conflicts.][cargo/7579] - [You can now override specific dependencies's build settings][cargo/7591] E.g. `[profile.dev.package.image] opt-level = 2` sets the `image` crate's optimisation level to `2` for debug builds. You can also use `[profile..build-override]` to override build scripts and their dependencies. Misc ---- - [You can now specify `edition` in documentation code blocks to compile the block for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample should be compiled the 2018 edition of Rust. - [You can now provide custom themes to rustdoc with `--theme`, and check the current theme with `--check-theme`.][54733] - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351] Compatibility Notes ------------------- - [As previously announced 1.41 will be the last tier 1 release for 32-bit Apple targets.][apple-32bit-drop] This means that the source code is still available to build, but the targets are no longer being tested and release binaries for those platforms will no longer be distributed by the Rust project. Please refer to the linked blog post for more information. [54733]: https://github.com/rust-lang/rust/pull/54733/ [61351]: https://github.com/rust-lang/rust/pull/61351/ [62514]: https://github.com/rust-lang/rust/pull/62514/ [67255]: https://github.com/rust-lang/rust/pull/67255/ [66661]: https://github.com/rust-lang/rust/pull/66661/ [66771]: https://github.com/rust-lang/rust/pull/66771/ [66847]: https://github.com/rust-lang/rust/pull/66847/ [66238]: https://github.com/rust-lang/rust/pull/66238/ [66277]: https://github.com/rust-lang/rust/pull/66277/ [66325]: https://github.com/rust-lang/rust/pull/66325/ [66172]: https://github.com/rust-lang/rust/pull/66172/ [66183]: https://github.com/rust-lang/rust/pull/66183/ [65879]: https://github.com/rust-lang/rust/pull/65879/ [65013]: https://github.com/rust-lang/rust/pull/65013/ [64882]: https://github.com/rust-lang/rust/pull/64882/ [64325]: https://github.com/rust-lang/rust/pull/64325/ [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/ [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/ [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/ [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/ [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html Version 1.40.0 (2019-12-19) =========================== Language -------- - [You can now use tuple `struct`s and tuple `enum` variant's constructors in `const` contexts.][65188] e.g. ```rust pub struct Point(i32, i32); const ORIGIN: Point = { let constructor = Point; constructor(0, 0) }; ``` - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to indicate that there may be variants or fields added in the future.][64639] For example this requires adding a wild-card branch (`_ => {}`) to any match statements on a non-exhaustive `enum`. [(RFC 2008)] - [You can now use function-like procedural macros in `extern` blocks and in type positions.][63931] e.g. `type Generated = macro!();` - [Function-like and attribute procedural macros can now emit `macro_rules!` items, so you can now have your macros generate macros.][64035] - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`, `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`. Compiler -------- - [Added tier 3 support\* for the `thumbv7neon-unknown-linux-musleabihf` target.][66103] - [Added tier 3 support for the `aarch64-unknown-none-softfloat` target.][64589] - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and `mips64el-unknown-linux-muslabi64` targets.][65843] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092] Stabilized APIs --------------- - [`BTreeMap::get_key_value`] - [`HashMap::get_key_value`] - [`Option::as_deref_mut`] - [`Option::as_deref`] - [`Option::flatten`] - [`UdpSocket::peer_addr`] - [`f32::to_be_bytes`] - [`f32::to_le_bytes`] - [`f32::to_ne_bytes`] - [`f64::to_be_bytes`] - [`f64::to_le_bytes`] - [`f64::to_ne_bytes`] - [`f32::from_be_bytes`] - [`f32::from_le_bytes`] - [`f32::from_ne_bytes`] - [`f64::from_be_bytes`] - [`f64::from_le_bytes`] - [`f64::from_ne_bytes`] - [`mem::take`] - [`slice::repeat`] - [`todo!`] Cargo ----- - [Cargo will now always display warnings, rather than only on fresh builds.][cargo/7450] - [Feature flags (except `--all-features`) passed to a virtual workspace will now produce an error.][cargo/7507] Previously these flags were ignored. - [You can now publish `dev-dependencies` without including a `version`.][cargo/7333] Misc ---- - [You can now specify the `#[cfg(doctest)]` attribute to include an item only when running documentation tests with `rustdoc`.][63803] Compatibility Notes ------------------- - [As previously announced, any previous NLL warnings in the 2015 edition are now hard errors.][64221] - [The `include!` macro will now warn if it failed to include the entire file.][64284] The `include!` macro unintentionally only includes the first _expression_ in a file, and this can be unintuitive. This will become either a hard error in a future release, or the behavior may be fixed to include all expressions as expected. - [Using `#[inline]` on function prototypes and consts now emits a warning under `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits or `extern` blocks now correctly emits a hard error. [65294]: https://github.com/rust-lang/rust/pull/65294/ [66103]: https://github.com/rust-lang/rust/pull/66103/ [65843]: https://github.com/rust-lang/rust/pull/65843/ [65188]: https://github.com/rust-lang/rust/pull/65188/ [65092]: https://github.com/rust-lang/rust/pull/65092/ [64589]: https://github.com/rust-lang/rust/pull/64589/ [64639]: https://github.com/rust-lang/rust/pull/64639/ [64221]: https://github.com/rust-lang/rust/pull/64221/ [64284]: https://github.com/rust-lang/rust/pull/64284/ [63931]: https://github.com/rust-lang/rust/pull/63931/ [64035]: https://github.com/rust-lang/rust/pull/64035/ [63674]: https://github.com/rust-lang/rust/pull/63674/ [63803]: https://github.com/rust-lang/rust/pull/63803/ [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/ [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/ [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/ [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html Version 1.39.0 (2019-11-07) =========================== Language -------- - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and `async {}` respectively, and you can now call `.await` on async expressions.][63209] - [You can now use certain attributes on function, closure, and function pointer parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`, `deny`, `forbid` as well as inert helper attributes used by procedural macro attributes applied to items. e.g. ```rust fn len( #[cfg(windows)] slice: &[u16], #[cfg(not(windows))] slice: &[u8], ) -> usize { slice.len() } ``` - [You can now take shared references to bind-by-move patterns in the `if` guards of `match` arms.][63118] e.g. ```rust fn main() { let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]); match array { nums // ---- `nums` is bound by move. if nums.iter().sum::() == 10 // ^------ `.iter()` implicitly takes a reference to `nums`. => { drop(nums); // ----------- Legal as `nums` was bound by move and so we have ownership. } _ => unreachable!(), } } ``` Compiler -------- - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334] - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595] - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402] **Note** Cargo currently doesn't use this feature. Refer to [cargo#7315][cargo/7315] to track this feature's progress. - [You can now pass `--show-output` argument to test binaries to print the output of successful tests.][62600] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [`Vec::new` and `String::new` are now `const` functions.][64028] - [`LinkedList::new` is now a `const` function.][63684] - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770] - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are now `const`.][63786] Stabilized APIs --------------- - [`Pin::into_inner`] - [`Instant::checked_duration_since`] - [`Instant::saturating_duration_since`] Cargo ----- - [You can now publish git dependencies if supplied with a `version`.][cargo/7237] - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using `--all` is now deprecated. Misc ---- - [You can now pass `-Clinker` to rustdoc to control the linker used for compiling doctests.][63834] Compatibility Notes ------------------- - [Code that was previously accepted by the old borrow checker, but rejected by the NLL borrow checker is now a hard error in Rust 2018.][63565] This was previously a warning, and will also become a hard error in the Rust 2015 edition in the 1.40.0 release. - [`rustdoc` now requires `rustc` to be installed and in the same directory to run tests.][63827] This should improve performance when running a large amount of doctests. - [The `try!` macro will now issue a deprecation warning.][62672] It is recommended to use the `?` operator instead. - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this returned `0.0`. [62600]: https://github.com/rust-lang/rust/pull/62600/ [62672]: https://github.com/rust-lang/rust/pull/62672/ [63118]: https://github.com/rust-lang/rust/pull/63118/ [63209]: https://github.com/rust-lang/rust/pull/63209/ [63402]: https://github.com/rust-lang/rust/pull/63402/ [63565]: https://github.com/rust-lang/rust/pull/63565/ [63595]: https://github.com/rust-lang/rust/pull/63595/ [63684]: https://github.com/rust-lang/rust/pull/63684/ [63698]: https://github.com/rust-lang/rust/pull/63698/ [63770]: https://github.com/rust-lang/rust/pull/63770/ [63786]: https://github.com/rust-lang/rust/pull/63786/ [63827]: https://github.com/rust-lang/rust/pull/63827/ [63834]: https://github.com/rust-lang/rust/pull/63834/ [64010]: https://github.com/rust-lang/rust/pull/64010/ [64028]: https://github.com/rust-lang/rust/pull/64028/ [64334]: https://github.com/rust-lang/rust/pull/64334/ [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/ [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/ [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/ [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since Version 1.38.0 (2019-09-26) ========================== Language -------- - [The `#[global_allocator]` attribute can now be used in submodules.][62735] - [The `#[deprecated]` attribute can now be used on macros.][62042] Compiler -------- - [Added pipelined compilation support to `rustc`.][62766] This will improve compilation times in some cases. For further information please refer to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread. - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`, `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and `x86_64-uwp-windows-msvc` targets.][60260] - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and `armv7-unknown-linux-musleabi` targets.][63107] - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814] - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784] - [Upgraded to LLVM 9.][62592] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421] - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now available at the same path as the trait.][63056] (e.g. The `Clone` derive macro is available at `std::clone::Clone`). This also makes all built-in macros available in `std`/`core` root. e.g. `std::include_bytes!`. - [`str::Chars` now implements `Debug`.][63000] - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528] - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583] - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator`.][61953] - [Added euclidean remainder and division operations (`div_euclid`, `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`, `overflowing`, and `wrapping` versions are available for all integer primitives. - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and `PartialEq`.][61491] - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457] Stabilized APIs --------------- - [`<*const T>::cast`] - [`<*mut T>::cast`] - [`Duration::as_secs_f32`] - [`Duration::as_secs_f64`] - [`Duration::div_f32`] - [`Duration::div_f64`] - [`Duration::from_secs_f32`] - [`Duration::from_secs_f64`] - [`Duration::mul_f32`] - [`Duration::mul_f64`] - [`any::type_name`] Cargo ----- - [Added pipelined compilation support to `cargo`.][cargo/7143] - [You can now pass the `--features` option multiple times to enable multiple features.][cargo/7084] Rustdoc ------- - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048] Misc ---- - [`rustc` will now warn about some incorrect uses of `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346] Compatibility Notes ------------------- - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc 1.38.0. - The [`armv7-unknown-linux-gnueabihf` platform is known to have issues][62896] with certain crates such as libc. [60260]: https://github.com/rust-lang/rust/pull/60260/ [61457]: https://github.com/rust-lang/rust/pull/61457/ [61491]: https://github.com/rust-lang/rust/pull/61491/ [61884]: https://github.com/rust-lang/rust/pull/61884/ [61953]: https://github.com/rust-lang/rust/pull/61953/ [62042]: https://github.com/rust-lang/rust/pull/62042/ [62528]: https://github.com/rust-lang/rust/pull/62528/ [62583]: https://github.com/rust-lang/rust/pull/62583/ [62735]: https://github.com/rust-lang/rust/pull/62735/ [62766]: https://github.com/rust-lang/rust/pull/62766/ [62784]: https://github.com/rust-lang/rust/pull/62784/ [62592]: https://github.com/rust-lang/rust/pull/62592/ [62785]: https://github.com/rust-lang/rust/issues/62785/ [62814]: https://github.com/rust-lang/rust/pull/62814/ [62896]: https://github.com/rust-lang/rust/issues/62896/ [63000]: https://github.com/rust-lang/rust/pull/63000/ [63056]: https://github.com/rust-lang/rust/pull/63056/ [63107]: https://github.com/rust-lang/rust/pull/63107/ [63346]: https://github.com/rust-lang/rust/pull/63346/ [63421]: https://github.com/rust-lang/rust/pull/63421/ [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/ [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/ [63048]: https://github.com/rust-lang/rust/pull/63048 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199 Version 1.37.0 (2019-08-15) ========================== Language -------- - `#[must_use]` will now warn if the type is contained in a [tuple][61100], [`Box`][62228], or an [array][62235] and unused. - [You can now use the `cfg` and `cfg_attr` attributes on generic parameters.][61547] - [You can now use enum variants through type alias.][61682] e.g. You can write the following: ```rust type MyOption = Option; fn increment_or_zero(x: MyOption) -> u8 { match x { MyOption::Some(y) => y + 1, MyOption::None => 0, } } ``` - [You can now use `_` as an identifier for consts.][61347] e.g. You can write `const _: u32 = 5;`. - [You can now use `#[repr(align(X)]` on enums.][61229] - [The `?` Kleene macro operator is now available in the 2015 edition.][60932] Compiler -------- - [You can now enable Profile-Guided Optimization with the `-C profile-generate` and `-C profile-use` flags.][61268] For more information on how to use profile guided optimization, please refer to the [rustc book][rustc-book-pgo]. - [The `rust-lldb` wrapper script should now work again.][61827] Libraries --------- - [`mem::MaybeUninit` is now ABI-compatible with `T`.][61802] Stabilized APIs --------------- - [`BufReader::buffer`] - [`BufWriter::buffer`] - [`Cell::from_mut`] - [`Cell<[T]>::as_slice_of_cells`][`Cell::as_slice_of_cells`] - [`DoubleEndedIterator::nth_back`] - [`Option::xor`] - [`Wrapping::reverse_bits`] - [`i128::reverse_bits`] - [`i16::reverse_bits`] - [`i32::reverse_bits`] - [`i64::reverse_bits`] - [`i8::reverse_bits`] - [`isize::reverse_bits`] - [`slice::copy_within`] - [`u128::reverse_bits`] - [`u16::reverse_bits`] - [`u32::reverse_bits`] - [`u64::reverse_bits`] - [`u8::reverse_bits`] - [`usize::reverse_bits`] Cargo ----- - [`Cargo.lock` files are now included by default when publishing executable crates with executables.][cargo/7026] - [You can now specify `default-run="foo"` in `[package]` to specify the default executable to use for `cargo run`.][cargo/7056] Misc ---- Compatibility Notes ------------------- - [Using `...` for inclusive range patterns will now warn by default.][61342] Please transition your code to using the `..=` syntax for inclusive ranges instead. - [Using a trait object without the `dyn` will now warn by default.][61203] Please transition your code to use `dyn Trait` for trait objects instead. [62228]: https://github.com/rust-lang/rust/pull/62228/ [62235]: https://github.com/rust-lang/rust/pull/62235/ [61802]: https://github.com/rust-lang/rust/pull/61802/ [61827]: https://github.com/rust-lang/rust/pull/61827/ [61547]: https://github.com/rust-lang/rust/pull/61547/ [61682]: https://github.com/rust-lang/rust/pull/61682/ [61268]: https://github.com/rust-lang/rust/pull/61268/ [61342]: https://github.com/rust-lang/rust/pull/61342/ [61347]: https://github.com/rust-lang/rust/pull/61347/ [61100]: https://github.com/rust-lang/rust/pull/61100/ [61203]: https://github.com/rust-lang/rust/pull/61203/ [61229]: https://github.com/rust-lang/rust/pull/61229/ [60932]: https://github.com/rust-lang/rust/pull/60932/ [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/ [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/ [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut [`Cell::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html Version 1.36.0 (2019-07-04) ========================== Language -------- - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114] - [The order of traits in trait objects no longer affects the semantics of that object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to `dyn fmt::Debug + Send`, where this was previously not the case. Libraries --------- - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623] - [`TryFromSliceError` now implements `From`.][60318] - [`mem::needs_drop` is now available as a const fn.][60364] - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370] - [`String` now implements `BorrowMut`.][60404] - [`io::Cursor` now implements `Default`.][60234] - [Both `NonNull::{dangling, cast}` are now const fns.][60244] - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the environment has access to heap memory allocation. - [`String` now implements `From<&String>`.][59825] - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will return a tuple of each argument when there is multiple arguments. - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if not used.][59648] Stabilized APIs --------------- - [`VecDeque::rotate_left`] - [`VecDeque::rotate_right`] - [`Iterator::copied`] - [`io::IoSlice`] - [`io::IoSliceMut`] - [`Read::read_vectored`] - [`Write::write_vectored`] - [`str::as_mut_ptr`] - [`mem::MaybeUninit`] - [`pointer::align_offset`] - [`future::Future`] - [`task::Context`] - [`task::RawWaker`] - [`task::RawWakerVTable`] - [`task::Waker`] - [`task::Poll`] Cargo ----- - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860] - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934] You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0]. Clippy ------ There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details. Misc ---- Compatibility Notes ------------------- - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no longer recommended, and will be deprecated in 1.39.0. [60318]: https://github.com/rust-lang/rust/pull/60318/ [60364]: https://github.com/rust-lang/rust/pull/60364/ [60370]: https://github.com/rust-lang/rust/pull/60370/ [60404]: https://github.com/rust-lang/rust/pull/60404/ [60234]: https://github.com/rust-lang/rust/pull/60234/ [60244]: https://github.com/rust-lang/rust/pull/60244/ [58623]: https://github.com/rust-lang/rust/pull/58623/ [59648]: https://github.com/rust-lang/rust/pull/59648/ [59675]: https://github.com/rust-lang/rust/pull/59675/ [59825]: https://github.com/rust-lang/rust/pull/59825/ [59826]: https://github.com/rust-lang/rust/pull/59826/ [59445]: https://github.com/rust-lang/rust/pull/59445/ [59114]: https://github.com/rust-lang/rust/pull/59114/ [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/ [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/ [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04 Version 1.35.0 (2019-05-23) ========================== Language -------- - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box`, `Box`, and `Box` respectively.][59500] - [You can now coerce closures into unsafe function pointers.][59580] e.g. ```rust unsafe fn call_unsafe(func: unsafe fn()) { func() } pub fn main() { unsafe { call_unsafe(|| {}); } } ``` Compiler -------- - [Added the `armv6-unknown-freebsd-gnueabihf` and `armv7-unknown-freebsd-gnueabihf` targets.][58080] - [Added the `wasm32-unknown-wasi` target.][59464] Libraries --------- - [`Thread` will now show its ID in `Debug` output.][59460] - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512] - [`alloc::System` now implements `Default`.][59451] - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the last field.][59076] - [`char::{ToLowercase, ToUppercase}` now implement `ExactSizeIterator`.][58778] - [All `NonZero` numeric types now implement `FromStr`.][58717] - [Removed the `Read` trait bounds on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423] - [You can now call the `dbg!` macro without any parameters to print the file and line where it is called.][57847] - [In place ASCII case conversions are now up to 4× faster.][59283] e.g. `str::make_ascii_lowercase` - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync` and `Send`.][58369] Stabilized APIs --------------- - [`f32::copysign`] - [`f64::copysign`] - [`RefCell::replace_with`] - [`RefCell::map_split`] - [`ptr::hash`] - [`Range::contains`] - [`RangeFrom::contains`] - [`RangeTo::contains`] - [`RangeInclusive::contains`] - [`RangeToInclusive::contains`] - [`Option::copied`] Cargo ----- - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly platform specific. Misc ---- - [The Rust toolchain is now available natively for musl based distros.][58575] [59460]: https://github.com/rust-lang/rust/pull/59460/ [59464]: https://github.com/rust-lang/rust/pull/59464/ [59500]: https://github.com/rust-lang/rust/pull/59500/ [59512]: https://github.com/rust-lang/rust/pull/59512/ [59580]: https://github.com/rust-lang/rust/pull/59580/ [59283]: https://github.com/rust-lang/rust/pull/59283/ [59451]: https://github.com/rust-lang/rust/pull/59451/ [59076]: https://github.com/rust-lang/rust/pull/59076/ [58778]: https://github.com/rust-lang/rust/pull/58778/ [58717]: https://github.com/rust-lang/rust/pull/58717/ [58369]: https://github.com/rust-lang/rust/pull/58369/ [58423]: https://github.com/rust-lang/rust/pull/58423/ [58080]: https://github.com/rust-lang/rust/pull/58080/ [57847]: https://github.com/rust-lang/rust/pull/57847/ [58575]: https://github.com/rust-lang/rust/pull/58575 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/ [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied Version 1.34.2 (2019-05-14) =========================== * [Destabilize the `Error::type_id` function due to a security vulnerability][60785] ([CVE-2019-12083]) [60785]: https://github.com/rust-lang/rust/pull/60785 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083 Version 1.34.1 (2019-04-25) =========================== * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821] * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844] * [Fix Clippy panic when checking some macros][clippy/3805] [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805 Version 1.34.0 (2019-04-11) ========================== Language -------- - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for `#[deprecated(note = "reason")]`. This was previously allowed by mistake but had no effect. - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and `#[attr{}]` procedural macros.][57367] - [You can now write `extern crate self as foo;`][57407] to import your crate's root into the extern prelude. Compiler -------- - [You can now target `riscv64imac-unknown-none-elf` and `riscv64gc-unknown-none-elf`.][58406] - [You can now enable linker plugin LTO optimisations with `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI boundaries. - [You can now target `powerpc64-unknown-freebsd`.][57809] Libraries --------- - [The trait bounds have been removed on some of `HashMap`'s and `HashSet`'s basic methods.][58370] Most notably you no longer require the `Hash` trait to create an iterator. - [The `Ord` trait bounds have been removed on some of `BinaryHeap`'s basic methods.][58421] Most notably you no longer require the `Ord` trait to create an iterator. - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions for all numeric types.][58044] - [Indexing a `str` is now generic over all types that implement `SliceIndex`.][57604] - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will produce a warning if their returning type is unused. - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and `overflowing_pow` are now available for all numeric types.][57873] These are equivalent to methods such as `wrapping_add` for the `pow` operation. Stabilized APIs --------------- #### std & core * [`Any::type_id`] * [`Error::type_id`] * [`atomic::AtomicI16`] * [`atomic::AtomicI32`] * [`atomic::AtomicI64`] * [`atomic::AtomicI8`] * [`atomic::AtomicU16`] * [`atomic::AtomicU32`] * [`atomic::AtomicU64`] * [`atomic::AtomicU8`] * [`convert::Infallible`] * [`convert::TryFrom`] * [`convert::TryInto`] * [`iter::from_fn`] * [`iter::successors`] * [`num::NonZeroI128`] * [`num::NonZeroI16`] * [`num::NonZeroI32`] * [`num::NonZeroI64`] * [`num::NonZeroI8`] * [`num::NonZeroIsize`] * [`slice::sort_by_cached_key`] * [`str::escape_debug`] * [`str::escape_default`] * [`str::escape_unicode`] * [`str::split_ascii_whitespace`] #### std * [`Instant::checked_add`] * [`Instant::checked_sub`] * [`SystemTime::checked_add`] * [`SystemTime::checked_sub`] Cargo ----- - [You can now use alternative registries to crates.io.][cargo/6654] Misc ---- - [You can now use the `?` operator in your documentation tests without manually adding `fn main() -> Result<(), _> {}`.][56470] Compatibility Notes ------------------- - [`Command::before_exec` is being replaced by the unsafe method `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0. - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you can now use `const` functions in `static` variables. [58370]: https://github.com/rust-lang/rust/pull/58370/ [58406]: https://github.com/rust-lang/rust/pull/58406/ [58421]: https://github.com/rust-lang/rust/pull/58421/ [58166]: https://github.com/rust-lang/rust/pull/58166/ [58044]: https://github.com/rust-lang/rust/pull/58044/ [58057]: https://github.com/rust-lang/rust/pull/58057/ [58059]: https://github.com/rust-lang/rust/pull/58059/ [57809]: https://github.com/rust-lang/rust/pull/57809/ [57873]: https://github.com/rust-lang/rust/pull/57873/ [57604]: https://github.com/rust-lang/rust/pull/57604/ [57367]: https://github.com/rust-lang/rust/pull/57367/ [57407]: https://github.com/rust-lang/rust/pull/57407/ [57425]: https://github.com/rust-lang/rust/pull/57425/ [57106]: https://github.com/rust-lang/rust/pull/57106/ [56470]: https://github.com/rust-lang/rust/pull/56470/ [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/ [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub Version 1.33.0 (2019-02-28) ========================== Language -------- - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g. `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }` - [Integer patterns such as in a match expression can now be exhaustive.][56362] E.g. You can have match statement on a `u8` that covers `0..=255` and you would no longer be required to have a `_ => unreachable!()` case. - [You can now have multiple patterns in `if let` and `while let` expressions.][57532] You can do this with the same syntax as a `match` expression. E.g. ```rust enum Creature { Crab(String), Lobster(String), Person(String), } fn main() { let state = Creature::Crab("Ferris"); if let Creature::Crab(name) | Creature::Person(name) = state { println!("This creature's name is: {}", name); } } ``` - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using this feature will by default produce a warning as this behaviour can be unintuitive. E.g. `if let _ = 5 {}` - [You can now use `let` bindings, assignments, expression statements, and irrefutable pattern destructuring in const functions.][57175] - [You can now call unsafe const functions.][57067] E.g. ```rust const unsafe fn foo() -> i32 { 5 } const fn bar() -> i32 { unsafe { foo() } } ``` - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332] E.g. `#[cfg_attr(all(), must_use, optimize)]` - [You can now specify a specific alignment with the `#[repr(packed)]` attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct with an alignment of 2 bytes and a size of 6 bytes. - [You can now import an item from a module as an `_`.][56303] This allows you to import a trait's impls, and not have the name in the namespace. E.g. ```rust use std::io::Read as _; // Allowed as there is only one `Read` in the module. pub trait Read {} ``` - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805]. Compiler -------- - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor` command line argument.][56351] - [The minimum required LLVM version has been bumped to 6.0.][56642] - [Added support for the PowerPC64 architecture on FreeBSD.][57615] - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to tier 2 support.][57130] Visit the [platform support][platform-support] page for information on Rust's platform support. - [Added support for the `thumbv7neon-linux-androideabi` and `thumbv7neon-unknown-linux-gnueabihf` targets.][56947] - [Added support for the `x86_64-unknown-uefi` target.][56769] Libraries --------- - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const` functions for all numeric types.][57566] - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}` are now `const` functions for all numeric types.][57105] - [The methods `is_positive` and `is_negative` are now `const` functions for all signed numeric types.][57105] - [The `get` method for all `NonZero` types is now `const`.][57167] - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`, `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all numeric types.][57234] - [`Ipv4Addr::new` is now a `const` function][57234] Stabilized APIs --------------- - [`unix::FileExt::read_exact_at`] - [`unix::FileExt::write_all_at`] - [`Option::transpose`] - [`Result::transpose`] - [`convert::identity`] - [`pin::Pin`] - [`marker::Unpin`] - [`marker::PhantomPinned`] - [`Vec::resize_with`] - [`VecDeque::resize_with`] - [`Duration::as_millis`] - [`Duration::as_micros`] - [`Duration::as_nanos`] Cargo ----- - [You can now publish crates that require a feature flag to compile with `cargo publish --features` or `cargo publish --all-features`.][cargo/6453] - [Cargo should now rebuild a crate if a file was modified during the initial build.][cargo/6484] Compatibility Notes ------------------- - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}` are now deprecated in the standard library, and their usage will now produce a warning. Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}` methods instead. - The `Error::cause` method has been deprecated in favor of `Error::source` which supports downcasting. - [Libtest no longer creates a new thread for each test when `--test-threads=1`. It also runs the tests in deterministic order][56243] [56243]: https://github.com/rust-lang/rust/pull/56243 [56303]: https://github.com/rust-lang/rust/pull/56303/ [56351]: https://github.com/rust-lang/rust/pull/56351/ [56362]: https://github.com/rust-lang/rust/pull/56362 [56642]: https://github.com/rust-lang/rust/pull/56642/ [56769]: https://github.com/rust-lang/rust/pull/56769/ [56805]: https://github.com/rust-lang/rust/pull/56805 [56947]: https://github.com/rust-lang/rust/pull/56947/ [57049]: https://github.com/rust-lang/rust/pull/57049/ [57067]: https://github.com/rust-lang/rust/pull/57067/ [57105]: https://github.com/rust-lang/rust/pull/57105 [57130]: https://github.com/rust-lang/rust/pull/57130/ [57167]: https://github.com/rust-lang/rust/pull/57167/ [57175]: https://github.com/rust-lang/rust/pull/57175/ [57234]: https://github.com/rust-lang/rust/pull/57234/ [57332]: https://github.com/rust-lang/rust/pull/57332/ [57465]: https://github.com/rust-lang/rust/pull/57465/ [57532]: https://github.com/rust-lang/rust/pull/57532/ [57535]: https://github.com/rust-lang/rust/pull/57535/ [57566]: https://github.com/rust-lang/rust/pull/57566/ [57615]: https://github.com/rust-lang/rust/pull/57615/ [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/ [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/ [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos [platform-support]: https://forge.rust-lang.org/platform-support.html Version 1.32.0 (2019-01-17) ========================== Language -------- #### 2018 edition - [You can now use the `?` operator in macro definitions.][56245] The `?` operator allows you to specify zero or one repetitions similar to the `*` and `+` operators. - [Module paths with no leading keyword like `super`, `self`, or `crate`, will now always resolve to the item (`enum`, `struct`, etc.) available in the module if present, before resolving to a external crate or an item the prelude.][56759] E.g. ```rust enum Color { Red, Green, Blue } use Color::*; ``` #### All editions - [You can now match against `PhantomData` types.][55837] - [You can now match against literals in macros with the `literal` specifier.][56072] This will match against a literal of any type. E.g. `1`, `'A'`, `"Hello World"` - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g. ```rust struct Point(i32, i32); impl Point { pub fn new(x: i32, y: i32) -> Self { Self(x, y) } pub fn is_origin(&self) -> bool { match self { Self(0, 0) => true, _ => false, } } } ``` - [Self can also now be used in type definitions.][56366] E.g. ```rust enum List where Self: PartialOrd // can write `Self` instead of `List` { Nil, Cons(T, Box) // likewise here } ``` - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if a `impl Trait` or `dyn Trait` is returned and unused in the program. Compiler -------- - [The default allocator has changed from jemalloc to the default allocator on your system.][55238] The compiler itself on Linux & macOS will still use jemalloc, but programs compiled with it will use the system allocator. - [Added the `aarch64-pc-windows-msvc` target.][55702] Libraries --------- - [`PathBuf` now implements `FromStr`.][55148] - [`Box<[T]>` now implements `FromIterator`.][55843] - [The `dbg!` macro has been stabilized.][56395] This macro enables you to easily debug expressions in your rust program. E.g. ```rust let a = 2; let b = dbg!(a * 2) + 1; // ^-- prints: [src/main.rs:4] a * 2 = 4 assert_eq!(b, 5); ``` The following APIs are now `const` functions and can be used in a `const` context. - [`Cell::as_ptr`] - [`UnsafeCell::get`] - [`char::is_ascii`] - [`iter::empty`] - [`ManuallyDrop::new`] - [`ManuallyDrop::into_inner`] - [`RangeInclusive::start`] - [`RangeInclusive::end`] - [`NonNull::as_ptr`] - [`slice::as_ptr`] - [`str::as_ptr`] - [`Duration::as_secs`] - [`Duration::subsec_millis`] - [`Duration::subsec_micros`] - [`Duration::subsec_nanos`] - [`CStr::as_ptr`] - [`Ipv4Addr::is_unspecified`] - [`Ipv6Addr::new`] - [`Ipv6Addr::octets`] Stabilized APIs --------------- - [`i8::to_be_bytes`] - [`i8::to_le_bytes`] - [`i8::to_ne_bytes`] - [`i8::from_be_bytes`] - [`i8::from_le_bytes`] - [`i8::from_ne_bytes`] - [`i16::to_be_bytes`] - [`i16::to_le_bytes`] - [`i16::to_ne_bytes`] - [`i16::from_be_bytes`] - [`i16::from_le_bytes`] - [`i16::from_ne_bytes`] - [`i32::to_be_bytes`] - [`i32::to_le_bytes`] - [`i32::to_ne_bytes`] - [`i32::from_be_bytes`] - [`i32::from_le_bytes`] - [`i32::from_ne_bytes`] - [`i64::to_be_bytes`] - [`i64::to_le_bytes`] - [`i64::to_ne_bytes`] - [`i64::from_be_bytes`] - [`i64::from_le_bytes`] - [`i64::from_ne_bytes`] - [`i128::to_be_bytes`] - [`i128::to_le_bytes`] - [`i128::to_ne_bytes`] - [`i128::from_be_bytes`] - [`i128::from_le_bytes`] - [`i128::from_ne_bytes`] - [`isize::to_be_bytes`] - [`isize::to_le_bytes`] - [`isize::to_ne_bytes`] - [`isize::from_be_bytes`] - [`isize::from_le_bytes`] - [`isize::from_ne_bytes`] - [`u8::to_be_bytes`] - [`u8::to_le_bytes`] - [`u8::to_ne_bytes`] - [`u8::from_be_bytes`] - [`u8::from_le_bytes`] - [`u8::from_ne_bytes`] - [`u16::to_be_bytes`] - [`u16::to_le_bytes`] - [`u16::to_ne_bytes`] - [`u16::from_be_bytes`] - [`u16::from_le_bytes`] - [`u16::from_ne_bytes`] - [`u32::to_be_bytes`] - [`u32::to_le_bytes`] - [`u32::to_ne_bytes`] - [`u32::from_be_bytes`] - [`u32::from_le_bytes`] - [`u32::from_ne_bytes`] - [`u64::to_be_bytes`] - [`u64::to_le_bytes`] - [`u64::to_ne_bytes`] - [`u64::from_be_bytes`] - [`u64::from_le_bytes`] - [`u64::from_ne_bytes`] - [`u128::to_be_bytes`] - [`u128::to_le_bytes`] - [`u128::to_ne_bytes`] - [`u128::from_be_bytes`] - [`u128::from_le_bytes`] - [`u128::from_ne_bytes`] - [`usize::to_be_bytes`] - [`usize::to_le_bytes`] - [`usize::to_ne_bytes`] - [`usize::from_be_bytes`] - [`usize::from_le_bytes`] - [`usize::from_ne_bytes`] Cargo ----- - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218] - [Usernames are now allowed in alt registry URLs.][cargo/6242] Misc ---- - [`libproc_macro` has been added to the `rust-src` distribution.][55280] Compatibility Notes ------------------- - [The argument types for AVX's `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have been changed from `*const` to `*mut` as the previous implementation was unsound. [55148]: https://github.com/rust-lang/rust/pull/55148/ [55238]: https://github.com/rust-lang/rust/pull/55238/ [55280]: https://github.com/rust-lang/rust/pull/55280/ [55610]: https://github.com/rust-lang/rust/pull/55610/ [55663]: https://github.com/rust-lang/rust/pull/55663/ [55702]: https://github.com/rust-lang/rust/pull/55702/ [55837]: https://github.com/rust-lang/rust/pull/55837/ [55843]: https://github.com/rust-lang/rust/pull/55843/ [56072]: https://github.com/rust-lang/rust/pull/56072/ [56245]: https://github.com/rust-lang/rust/pull/56245/ [56365]: https://github.com/rust-lang/rust/pull/56365/ [56366]: https://github.com/rust-lang/rust/pull/56366/ [56395]: https://github.com/rust-lang/rust/pull/56395/ [56759]: https://github.com/rust-lang/rust/pull/56759/ [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/ [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/ [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes Version 1.31.1 (2018-12-20) =========================== - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562] - [Fix broken go-to-definition in RLS][rls/1171] - [Fix infinite loop on hover in RLS][rls/1170] [56562]: https://github.com/rust-lang/rust/pull/56562 [rls/1171]: https://github.com/rust-lang/rls/issues/1171 [rls/1170]: https://github.com/rust-lang/rls/pull/1170 Version 1.31.0 (2018-12-06) ========================== Language -------- - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉 - [New lifetime elision rules now allow for eliding lifetimes in functions and impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined in structs. - [You can now define and use `const` functions.][54835] These are currently a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the [language reference][const-reference] for what exactly is available. - [You can now use tool lints, which allow you to scope lints from external tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`. - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in a crate, not just in exported functions.][54451] - [You can now use parentheses in pattern matches.][54497] Compiler -------- - [Updated musl to 1.1.20][54430] Libraries --------- - [You can now convert `num::NonZero*` types to their raw equivalents using the `From` trait.][54240] E.g. `u8` now implements `From`. - [You can now convert a `&Option` into `Option<&T>` and `&mut Option` into `Option<&mut T>` using the `From` trait.][53218] - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813] Stabilized APIs --------------- - [`slice::align_to`] - [`slice::align_to_mut`] - [`slice::chunks_exact`] - [`slice::chunks_exact_mut`] - [`slice::rchunks`] - [`slice::rchunks_mut`] - [`slice::rchunks_exact`] - [`slice::rchunks_exact_mut`] - [`Option::replace`] Cargo ----- - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005] - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide on [how to use the `package` key in your dependencies.][cargo-rename-reference] [52813]: https://github.com/rust-lang/rust/pull/52813/ [53218]: https://github.com/rust-lang/rust/pull/53218/ [54057]: https://github.com/rust-lang/rust/pull/54057/ [54240]: https://github.com/rust-lang/rust/pull/54240/ [54430]: https://github.com/rust-lang/rust/pull/54430/ [54451]: https://github.com/rust-lang/rust/pull/54451/ [54497]: https://github.com/rust-lang/rust/pull/54497/ [54778]: https://github.com/rust-lang/rust/pull/54778/ [54835]: https://github.com/rust-lang/rust/pull/54835/ [54870]: https://github.com/rust-lang/rust/pull/54870/ [RFC-911]: https://github.com/rust-lang/rfcs/pull/911 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/ [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/ [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions Version 1.30.1 (2018-11-08) =========================== - [Fixed overflow ICE in rustdoc][54199] - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122] [54199]: https://github.com/rust-lang/rust/pull/54199 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122 Version 1.30.0 (2018-10-25) ========================== Language -------- - [Procedural macros are now available.][52081] These kinds of macros allow for more powerful code generation. There is a [new chapter available][proc-macros] in the Rust Programming Language book that goes further in depth. - [You can now use keywords as identifiers using the raw identifiers syntax (`r#`),][53236] e.g. `let r#for = true;` - [Using anonymous parameters in traits is now deprecated with a warning and will be a hard error in the 2018 edition.][53272] - [You can now use `crate` in paths.][54404] This allows you to refer to the crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`. - [Using a external crate no longer requires being prefixed with `::`.][54404] Previously, using a external crate in a module without a use statement required `let json = ::serde_json::from_str(foo);` but can now be written as `let json = serde_json::from_str(foo);`. - [You can now apply the `#[used]` attribute to static items to prevent the compiler from optimising them away, even if they appear to be unused,][51363] e.g. `#[used] static FOO: u32 = 1;` - [You can now import and reexport macros from other crates with the `use` syntax.][50911] Macros exported with `#[macro_export]` are now placed into the root module of the crate. If your macro relies on calling other local macros, it is recommended to export with the `#[macro_export(local_inner_macros)]` attribute so users won't have to import those macros. - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros using the `vis` specifier.][53370] - [Non-macro attributes now allow all forms of literals, not just strings.][53044] Previously, you would write `#[attr("true")]`, and you can now write `#[attr(true)]`. - [You can now specify a function to handle a panic in the Rust runtime with the `#[panic_handler]` attribute.][51366] Compiler -------- - [Added the `riscv32imc-unknown-none-elf` target.][53822] - [Added the `aarch64-unknown-netbsd` target][53165] - [Upgraded to LLVM 8.][53611] Libraries --------- - [`ManuallyDrop` now allows the inner type to be unsized.][53033] Stabilized APIs --------------- - [`Ipv4Addr::BROADCAST`] - [`Ipv4Addr::LOCALHOST`] - [`Ipv4Addr::UNSPECIFIED`] - [`Ipv6Addr::LOCALHOST`] - [`Ipv6Addr::UNSPECIFIED`] - [`Iterator::find_map`] The following methods are replacement methods for `trim_left`, `trim_right`, `trim_left_matches`, and `trim_right_matches`, which will be deprecated in 1.33.0: - [`str::trim_end_matches`] - [`str::trim_end`] - [`str::trim_start_matches`] - [`str::trim_start`] Cargo ---- - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877] - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is equivalent to calling `rustdoc --error-format=json`. - [Cargo will now provide a progress bar for builds.][cargo/5995] Misc ---- - [`rustdoc` allows you to specify what edition to treat your code as with the `--edition` option.][54057] - [`rustdoc` now has the `--color` (specify whether to output color) and `--error-format` (specify error format, e.g. `json`) options.][53003] - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust debug symbols.][53774] - [Attributes from Rust tools such as `rustfmt` or `clippy` are now available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item. [50911]: https://github.com/rust-lang/rust/pull/50911/ [51363]: https://github.com/rust-lang/rust/pull/51363/ [51366]: https://github.com/rust-lang/rust/pull/51366/ [52081]: https://github.com/rust-lang/rust/pull/52081/ [53003]: https://github.com/rust-lang/rust/pull/53003/ [53033]: https://github.com/rust-lang/rust/pull/53033/ [53044]: https://github.com/rust-lang/rust/pull/53044/ [53165]: https://github.com/rust-lang/rust/pull/53165/ [53611]: https://github.com/rust-lang/rust/pull/53611/ [53236]: https://github.com/rust-lang/rust/pull/53236/ [53272]: https://github.com/rust-lang/rust/pull/53272/ [53370]: https://github.com/rust-lang/rust/pull/53370/ [53459]: https://github.com/rust-lang/rust/pull/53459/ [53774]: https://github.com/rust-lang/rust/pull/53774/ [53822]: https://github.com/rust-lang/rust/pull/53822/ [54057]: https://github.com/rust-lang/rust/pull/54057/ [54404]: https://github.com/rust-lang/rust/pull/54404/ [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/ [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/ [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/ [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start Version 1.29.2 (2018-10-11) =========================== - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639] - The `rls-preview` component on the windows-gnu targets has been restored. [54639]: https://github.com/rust-lang/rust/pull/54639 Version 1.29.1 (2018-09-25) =========================== Security Notes -------------- - The standard library's `str::repeat` function contained an out of bounds write caused by an integer overflow. This has been fixed by deterministically panicking when an overflow happens. Thank you to Scott McMurray for responsibly disclosing this vulnerability to us. Version 1.29.0 (2018-09-13) ========================== Compiler -------- - [Bumped minimum LLVM version to 5.0.][51899] - [Added `powerpc64le-unknown-linux-musl` target.][51619] - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861] - [Upgraded to LLVM 7.][51966] Libraries --------- - [`Once::call_once` no longer requires `Once` to be `'static`.][52239] - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402] - [`Box`, `Box`, and `Box` now implement `Clone`.][51912] - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq` for `&str`.][51178] - [`Cell` now allows `T` to be unsized.][50494] - [`SocketAddr` is now stable on Redox.][52656] Stabilized APIs --------------- - [`Arc::downcast`] - [`Iterator::flatten`] - [`Rc::downcast`] Cargo ----- - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use `--locked` to disable this behavior. - [`cargo-install` will now allow you to cross compile an install using `--target`.][cargo/5614] - [Added the `cargo-fix` subcommand to automatically move project code from 2015 edition to 2018.][cargo/5723] - [`cargo doc` can now optionally document private types using the `--document-private-items` flag.][cargo/5543] Misc ---- - [`rustdoc` now has the `--cap-lints` option which demotes all lints above the specified level to that level.][52354] For example `--cap-lints warn` will demote `deny` and `forbid` lints to `warn`. - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation fails and `101` if there is a panic.][52197] - [A preview of clippy has been made available through rustup.][51122] You can install the preview with `rustup component add clippy-preview`. Compatibility Notes ------------------- - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807] Use `str::get_unchecked(begin..end)` instead. - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656] Consider using the `home_dir` function from https://crates.io/crates/dirs instead. - [`rustc` will no longer silently ignore invalid data in target spec.][52330] - [`cfg` attributes and `--cfg` command line flags are now more strictly validated.][53893] [53893]: https://github.com/rust-lang/rust/pull/53893/ [52861]: https://github.com/rust-lang/rust/pull/52861/ [51966]: https://github.com/rust-lang/rust/pull/51966/ [52656]: https://github.com/rust-lang/rust/pull/52656/ [52239]: https://github.com/rust-lang/rust/pull/52239/ [52330]: https://github.com/rust-lang/rust/pull/52330/ [52354]: https://github.com/rust-lang/rust/pull/52354/ [52402]: https://github.com/rust-lang/rust/pull/52402/ [52197]: https://github.com/rust-lang/rust/pull/52197/ [51807]: https://github.com/rust-lang/rust/pull/51807/ [51899]: https://github.com/rust-lang/rust/pull/51899/ [51912]: https://github.com/rust-lang/rust/pull/51912/ [51619]: https://github.com/rust-lang/rust/pull/51619/ [51656]: https://github.com/rust-lang/rust/pull/51656/ [51178]: https://github.com/rust-lang/rust/pull/51178/ [51122]: https://github.com/rust-lang/rust/pull/51122 [50494]: https://github.com/rust-lang/rust/pull/50494/ [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/ [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/ [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/ [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast Version 1.28.0 (2018-08-02) =========================== Language -------- - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute allows a Rust newtype wrapper (`struct NewType(T);`) to be represented as the inner type across Foreign Function Interface (FFI) boundaries. - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved and can now be used as identifiers.][51196] - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now stable.][51241] This will allow users to specify a global allocator for their program. - [Unit test functions marked with the `#[test]` attribute can now return `Result<(), E: Debug>` in addition to `()`.][51298] - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This allows macros to easily target lifetimes. Compiler -------- - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations prioritise making smaller binary sizes. `z` is the same as `s` with the exception that it does not vectorise loops, which typically results in an even smaller binary. - [The short error format is now stable.][49546] Specified with `--error-format=short` this option will provide a more compressed output of rust error messages. - [Added a lint warning when you have duplicated `macro_export`s.][50143] - [Reduced the number of allocations in the macro parser.][50855] This can improve compile times of macro heavy crates on average by 5%. Libraries --------- - [Implemented `Default` for `&mut str`.][51306] - [Implemented `From` for all integer and unsigned number types.][50554] - [Implemented `Extend` for `()`.][50234] - [The `Debug` implementation of `time::Duration` should now be more easily human readable.][50364] Previously a `Duration` of one second would printed as `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`. - [Implemented `From<&String>` for `Cow`, `From<&Vec>` for `Cow<[T]>`, `From>` for `CString`, `From, From, From<&CString>` for `Cow`, `From, From, From<&OsString>` for `Cow`, `From<&PathBuf>` for `Cow`, and `From>` for `PathBuf`.][50170] - [Implemented `Shl` and `Shr` for `Wrapping` and `Wrapping`.][50465] - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when possible.][51050] This can provide up to a 40% speed increase. - [Improved error messages when using `format!`.][50610] Stabilized APIs --------------- - [`Iterator::step_by`] - [`Path::ancestors`] - [`SystemTime::UNIX_EPOCH`] - [`alloc::GlobalAlloc`] - [`alloc::Layout`] - [`alloc::LayoutErr`] - [`alloc::System`] - [`alloc::alloc`] - [`alloc::alloc_zeroed`] - [`alloc::dealloc`] - [`alloc::realloc`] - [`alloc::handle_alloc_error`] - [`btree_map::Entry::or_default`] - [`fmt::Alignment`] - [`hash_map::Entry::or_default`] - [`iter::repeat_with`] - [`num::NonZeroUsize`] - [`num::NonZeroU128`] - [`num::NonZeroU16`] - [`num::NonZeroU32`] - [`num::NonZeroU64`] - [`num::NonZeroU8`] - [`ops::RangeBounds`] - [`slice::SliceIndex`] - [`slice::from_mut`] - [`slice::from_ref`] - [`{Any + Send + Sync}::downcast_mut`] - [`{Any + Send + Sync}::downcast_ref`] - [`{Any + Send + Sync}::is`] Cargo ----- - [Cargo will now no longer allow you to publish crates with build scripts that modify the `src` directory.][cargo/5584] The `src` directory in a crate should be considered to be immutable. Misc ---- - [The `suggestion_applicability` field in `rustc`'s json output is now stable.][50486] This will allow dev tools to check whether a code suggestion would apply to them. Compatibility Notes ------------------- - [Rust will consider trait objects with duplicated constraints to be the same type as without the duplicated constraint.][51276] For example the below code will now fail to compile. ```rust trait Trait {} impl Trait + Send { fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test` } impl Trait + Send + Send { fn test(&self) { println!("two"); } } ``` [49546]: https://github.com/rust-lang/rust/pull/49546/ [50143]: https://github.com/rust-lang/rust/pull/50143/ [50170]: https://github.com/rust-lang/rust/pull/50170/ [50234]: https://github.com/rust-lang/rust/pull/50234/ [50265]: https://github.com/rust-lang/rust/pull/50265/ [50364]: https://github.com/rust-lang/rust/pull/50364/ [50385]: https://github.com/rust-lang/rust/pull/50385/ [50465]: https://github.com/rust-lang/rust/pull/50465/ [50486]: https://github.com/rust-lang/rust/pull/50486/ [50554]: https://github.com/rust-lang/rust/pull/50554/ [50610]: https://github.com/rust-lang/rust/pull/50610/ [50855]: https://github.com/rust-lang/rust/pull/50855/ [51050]: https://github.com/rust-lang/rust/pull/51050/ [51196]: https://github.com/rust-lang/rust/pull/51196/ [51241]: https://github.com/rust-lang/rust/pull/51241/ [51276]: https://github.com/rust-lang/rust/pull/51276/ [51298]: https://github.com/rust-lang/rust/pull/51298/ [51306]: https://github.com/rust-lang/rust/pull/51306/ [51562]: https://github.com/rust-lang/rust/pull/51562/ [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/ [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2 Version 1.27.2 (2018-07-20) =========================== Compatibility Notes ------------------- - The borrow checker was fixed to avoid potential unsoundness when using match ergonomics: [#52213][52213]. [52213]: https://github.com/rust-lang/rust/issues/52213 Version 1.27.1 (2018-07-10) =========================== Security Notes -------------- - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory when running, which enabled executing code as some other user on a given machine. This release fixes that vulnerability; you can read more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622]. Thank you to Red Hat for responsibly disclosing this vulnerability to us. Compatibility Notes ------------------- - The borrow checker was fixed to avoid an additional potential unsoundness when using match ergonomics: [#51415][51415], [#49534][49534]. [51415]: https://github.com/rust-lang/rust/issues/51415 [49534]: https://github.com/rust-lang/rust/issues/49534 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622 Version 1.27.0 (2018-06-21) ========================== Language -------- - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to be used as an identifier. - [The dyn syntax is now available.][49968] This syntax is equivalent to the bare `Trait` syntax, and should make it clearer when being used in tandem with `impl Trait` because it is equivalent to the following syntax: `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and `Box == Box`. - [Attributes on generic parameters such as types and lifetimes are now stable.][48851] e.g. `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}` - [The `#[must_use]` attribute can now also be used on functions as well as types.][48925] It provides a lint that by default warns users when the value returned by a function has not been used. Compiler -------- - [Added the `armv5te-unknown-linux-musleabi` target.][50423] Libraries --------- - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664] This includes [`arch::x86`] & [`arch::x86_64`] modules which contain SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to the `cfg` attribute. - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in std are now available in core.][49896] - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults to `Self`.][49630] - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify that the operation isn't done in place. - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have the `#[must_use]` attribute][49533] to warn about unused potentially expensive allocations. Stabilized APIs --------------- - [`DoubleEndedIterator::rfind`] - [`DoubleEndedIterator::rfold`] - [`DoubleEndedIterator::try_rfold`] - [`Duration::from_micros`] - [`Duration::from_nanos`] - [`Duration::subsec_micros`] - [`Duration::subsec_millis`] - [`HashMap::remove_entry`] - [`Iterator::try_fold`] - [`Iterator::try_for_each`] - [`NonNull::cast`] - [`Option::filter`] - [`String::replace_range`] - [`Take::set_limit`] - [`hint::unreachable_unchecked`] - [`os::unix::process::parent_id`] - [`ptr::swap_nonoverlapping`] - [`slice::rsplit_mut`] - [`slice::rsplit`] - [`slice::swap_with_slice`] Cargo ----- - [`cargo-metadata` now includes `authors`, `categories`, `keywords`, `readme`, and `repository` fields.][cargo/5386] - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360] - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify a different directory than `target` for placing compilation artifacts. - [Cargo will be adding automatic target inference for binaries, benchmarks, examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies specific targets, e.g. using `[[bin]]`, and have other binaries in locations where cargo would infer a binary, Cargo will produce a warning. You can disable this feature ahead of time by setting any of the following to false: `autobins`, `autobenches`, `autoexamples`, `autotests`. - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by setting `CARGO_CACHE_RUSTC_INFO=0` in your environment. Misc ---- - [Added “The Rustc book” into the official documentation.][49707] [“The Rustc book”] documents and teaches how to use the rustc compiler. - [All books available on `doc.rust-lang.org` are now searchable.][49623] Compatibility Notes ------------------- - [Calling a `CharExt` or `StrExt` method directly on core will no longer work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not compile, `"".is_empty()` will still compile. - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}` will only print the inner type.][48553] E.g. `print!("{:?}", AtomicBool::new(true))` will print `true`, not `AtomicBool(true)`. - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you could enter higher numbers but they were not supported by LLVM. Up to 512MB alignment should cover all use cases. - The `.description()` method on the `std::error::Error` trait [has been soft-deprecated][50163]. It is no longer required to implement it. [48553]: https://github.com/rust-lang/rust/pull/48553/ [48851]: https://github.com/rust-lang/rust/pull/48851/ [48925]: https://github.com/rust-lang/rust/pull/48925/ [49533]: https://github.com/rust-lang/rust/pull/49533/ [49623]: https://github.com/rust-lang/rust/pull/49623/ [49630]: https://github.com/rust-lang/rust/pull/49630/ [49664]: https://github.com/rust-lang/rust/pull/49664/ [49699]: https://github.com/rust-lang/rust/pull/49699/ [49707]: https://github.com/rust-lang/rust/pull/49707/ [49896]: https://github.com/rust-lang/rust/pull/49896/ [49968]: https://github.com/rust-lang/rust/pull/49968/ [50163]: https://github.com/rust-lang/rust/pull/50163 [50177]: https://github.com/rust-lang/rust/pull/50177/ [50378]: https://github.com/rust-lang/rust/pull/50378/ [50423]: https://github.com/rust-lang/rust/pull/50423/ [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/ [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/ [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/ [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/ [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/ [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html [“The Rustc book”]: https://doc.rust-lang.org/rustc Version 1.26.2 (2018-06-05) ========================== Compatibility Notes ------------------- - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117] [51117]: https://github.com/rust-lang/rust/issues/51117 Version 1.26.1 (2018-05-29) ========================== Tools ----- - [RLS now works on Windows.][50646] - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695] Compatibility Notes -------- - [`fn main() -> impl Trait` no longer works for non-Termination trait.][50656] This reverts an accidental stabilization. - [`NaN > NaN` no longer returns true in const-fn contexts.][50812] - [Prohibit using turbofish for `impl Trait` in method arguments.][50950] [50646]: https://github.com/rust-lang/rust/issues/50646 [50656]: https://github.com/rust-lang/rust/pull/50656 [50812]: https://github.com/rust-lang/rust/pull/50812 [50950]: https://github.com/rust-lang/rust/issues/50950 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695 Version 1.26.0 (2018-05-10) ========================== Language -------- - [Closures now implement `Copy` and/or `Clone` if all captured variables implement either or both traits.][49299] - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813] - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a lifetime can be elided.][49458] - [`impl Trait` is now stable allowing you to have abstract types in returns or in function parameters.][49255] E.g. `fn foo() -> impl Iterator` or `fn open(path: impl AsRef)`. - [Pattern matching will now automatically apply dereferences.][49394] - [128-bit integers in the form of `u128` and `i128` are now stable.][49101] - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`. - [A lot of operations are now available in a const context.][46882] E.g. You can now index into constant arrays, reference and dereference into constants, and use tuple struct constructors. - [Fixed entry slice patterns are now stable.][48516] E.g. ```rust let points = [1, 2, 3, 4]; match points { [1, 2, 3, 4] => println!("All points were sequential."), _ => println!("Not all points were sequential."), } ``` Compiler -------- - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125] - [Fixed exponential projection complexity on nested types.][48296] This can provide up to a ~12% reduction in compile times for certain crates. - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you to remap path prefixes outputted by the compiler. - [Added `powerpc-unknown-netbsd` target.][48281] Libraries --------- - [Implemented `From for usize` & `From<{u8, i16}> for isize`.][49305] - [Added hexadecimal formatting for integers with fmt::Debug][48978] e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")` - [Implemented `Default, Hash` for `cmp::Reverse`.][48628] - [Optimized `str::repeat` being 8x faster in large cases.][48657] - [`ascii::escape_default` is now available in libcore.][48735] - [Trailing commas are now supported in std and core macros.][48056] - [Implemented `Copy, Clone` for `cmp::Reverse`][47379] - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629] Stabilized APIs --------------- - [`*const T::add`] - [`*const T::copy_to_nonoverlapping`] - [`*const T::copy_to`] - [`*const T::read_unaligned`] - [`*const T::read_volatile`] - [`*const T::read`] - [`*const T::sub`] - [`*const T::wrapping_add`] - [`*const T::wrapping_sub`] - [`*mut T::add`] - [`*mut T::copy_to_nonoverlapping`] - [`*mut T::copy_to`] - [`*mut T::read_unaligned`] - [`*mut T::read_volatile`] - [`*mut T::read`] - [`*mut T::replace`] - [`*mut T::sub`] - [`*mut T::swap`] - [`*mut T::wrapping_add`] - [`*mut T::wrapping_sub`] - [`*mut T::write_bytes`] - [`*mut T::write_unaligned`] - [`*mut T::write_volatile`] - [`*mut T::write`] - [`Box::leak`] - [`FromUtf8Error::as_bytes`] - [`LocalKey::try_with`] - [`Option::cloned`] - [`btree_map::Entry::and_modify`] - [`fs::read_to_string`] - [`fs::read`] - [`fs::write`] - [`hash_map::Entry::and_modify`] - [`iter::FusedIterator`] - [`ops::RangeInclusive`] - [`ops::RangeToInclusive`] - [`process::id`] - [`slice::rotate_left`] - [`slice::rotate_right`] - [`String::retain`] Cargo ----- - [Cargo will now output path to custom commands when `-v` is passed with `--list`][cargo/5041] - [The Cargo binary version is now the same as the Rust version][cargo/5083] Misc ---- - [The second edition of "The Rust Programming Language" book is now recommended over the first.][48404] Compatibility Notes ------------------- - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following syntax is now invalid. ``` use std::ops::Fn as dyn; fn g(_: Box) {} ``` - [The result of dereferences are no longer promoted to `'static`.][47408] e.g. ```rust fn main() { const PAIR: &(i32, i32) = &(0, 1); let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work } ``` - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109] - [`".e0"` will now no longer parse as `0.0` and will instead cause an error.][48235] - [Removed hoedown from rustdoc.][48274] - [Bounds on higher-kinded lifetimes a hard error.][48326] [46882]: https://github.com/rust-lang/rust/pull/46882 [47379]: https://github.com/rust-lang/rust/pull/47379 [47408]: https://github.com/rust-lang/rust/pull/47408 [47813]: https://github.com/rust-lang/rust/pull/47813 [48056]: https://github.com/rust-lang/rust/pull/48056 [48125]: https://github.com/rust-lang/rust/pull/48125 [48235]: https://github.com/rust-lang/rust/pull/48235 [48274]: https://github.com/rust-lang/rust/pull/48274 [48281]: https://github.com/rust-lang/rust/pull/48281 [48296]: https://github.com/rust-lang/rust/pull/48296 [48326]: https://github.com/rust-lang/rust/pull/48326 [48359]: https://github.com/rust-lang/rust/pull/48359 [48404]: https://github.com/rust-lang/rust/pull/48404 [48481]: https://github.com/rust-lang/rust/pull/48481 [48516]: https://github.com/rust-lang/rust/pull/48516 [48628]: https://github.com/rust-lang/rust/pull/48628 [48629]: https://github.com/rust-lang/rust/pull/48629 [48657]: https://github.com/rust-lang/rust/pull/48657 [48735]: https://github.com/rust-lang/rust/pull/48735 [48978]: https://github.com/rust-lang/rust/pull/48978 [49101]: https://github.com/rust-lang/rust/pull/49101 [49109]: https://github.com/rust-lang/rust/pull/49109 [49162]: https://github.com/rust-lang/rust/pull/49162 [49255]: https://github.com/rust-lang/rust/pull/49255 [49299]: https://github.com/rust-lang/rust/pull/49299 [49305]: https://github.com/rust-lang/rust/pull/49305 [49394]: https://github.com/rust-lang/rust/pull/49394 [49458]: https://github.com/rust-lang/rust/pull/49458 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083 Version 1.25.0 (2018-03-29) ========================== Language -------- - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358] - [You can now use nested groups of imports.][47948] e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};` - [You can now have `|` at the start of a match arm.][47947] e.g. ```rust enum Foo { A, B, C } fn main() { let x = Foo::A; match x { | Foo::A | Foo::B => println!("AB"), | Foo::C => println!("C"), } } ``` Compiler -------- - [Upgraded to LLVM 6.][47828] - [Added `-C lto=val` option.][47521] - [Added `i586-unknown-linux-musl` target][47282] Libraries --------- - [Impl Send for `process::Command` on Unix.][47760] - [Impl PartialEq and Eq for `ParseCharError`.][47790] - [`UnsafeCell::into_inner` is now safe.][47204] - [Implement libstd for CloudABI.][47268] - [`Float::{from_bits, to_bits}` is now available in libcore.][46931] - [Implement `AsRef` for Component][46985] - [Implemented `Write` for `Cursor<&mut Vec>`][46830] - [Moved `Duration` to libcore.][46666] Stabilized APIs --------------- - [`Location::column`] - [`ptr::NonNull`] The following functions can now be used in a constant expression. eg. `static MINUTE: Duration = Duration::from_secs(60);` - [`Duration::new`][47300] - [`Duration::from_secs`][47300] - [`Duration::from_millis`][47300] Cargo ----- - [`cargo new` no longer removes `rust` or `rs` prefixes/suffixes.][cargo/5013] - [`cargo new` now defaults to creating a binary crate, instead of a library crate.][cargo/5029] Misc ---- - [Rust by example is now shipped with new releases][46196] Compatibility Notes ------------------- - [Deprecated `net::lookup_host`.][47510] - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398] - The borrow checker was sometimes incorrectly permitting overlapping borrows around indexing operations (see [#47349][47349]). This has been fixed (which also enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]). - [Removed deprecated unstable attribute `#[simd]`.][47251] [33903]: https://github.com/rust-lang/rust/pull/33903 [47947]: https://github.com/rust-lang/rust/pull/47947 [47948]: https://github.com/rust-lang/rust/pull/47948 [47760]: https://github.com/rust-lang/rust/pull/47760 [47790]: https://github.com/rust-lang/rust/pull/47790 [47828]: https://github.com/rust-lang/rust/pull/47828 [47398]: https://github.com/rust-lang/rust/pull/47398 [47510]: https://github.com/rust-lang/rust/pull/47510 [47521]: https://github.com/rust-lang/rust/pull/47521 [47204]: https://github.com/rust-lang/rust/pull/47204 [47251]: https://github.com/rust-lang/rust/pull/47251 [47268]: https://github.com/rust-lang/rust/pull/47268 [47282]: https://github.com/rust-lang/rust/pull/47282 [47300]: https://github.com/rust-lang/rust/pull/47300 [47349]: https://github.com/rust-lang/rust/pull/47349 [46931]: https://github.com/rust-lang/rust/pull/46931 [46985]: https://github.com/rust-lang/rust/pull/46985 [47006]: https://github.com/rust-lang/rust/pull/47006 [46830]: https://github.com/rust-lang/rust/pull/46830 [46095]: https://github.com/rust-lang/rust/pull/46095 [46666]: https://github.com/rust-lang/rust/pull/46666 [46196]: https://github.com/rust-lang/rust/pull/46196 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html Version 1.24.1 (2018-03-01) ========================== - [Do not abort when unwinding through FFI][48251] - [Emit UTF-16 files for linker arguments on Windows][48318] - [Make the error index generator work again][48308] - [Cargo will warn on Windows 7 if an update is needed][cargo/5069]. [48251]: https://github.com/rust-lang/rust/issues/48251 [48308]: https://github.com/rust-lang/rust/issues/48308 [48318]: https://github.com/rust-lang/rust/issues/48318 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069 Version 1.24.0 (2018-02-15) ========================== Language -------- - [External `sysv64` ffi is now available.][46528] eg. `extern "sysv64" fn foo () {}` Compiler -------- - [rustc now uses 16 codegen units by default for release builds.][46910] For the fastest builds, utilize `codegen-units=1`. - [Added `armv4t-unknown-linux-gnueabi` target.][47018] - [Add `aarch64-unknown-openbsd` support][46760] Libraries --------- - [`str::find::` now uses memchr.][46735] This should lead to a 10x improvement in performance in the majority of cases. - [`OsStr`'s `Debug` implementation is now lossless and consistent with Windows.][46798] - [`time::{SystemTime, Instant}` now implement `Hash`.][46828] - [impl `From` for `AtomicBool`][46293] - [impl `From<{CString, &CStr}>` for `{Arc, Rc}`][45990] - [impl `From<{OsString, &OsStr}>` for `{Arc, Rc}`][45990] - [impl `From<{PathBuf, &Path}>` for `{Arc, Rc}`][45990] - [float::from_bits now just uses transmute.][46012] This provides some optimisations from LLVM. - [Copied `AsciiExt` methods onto `char`][46077] - [Remove `T: Sized` requirement on `ptr::is_null()`][46094] - [impl `From` for `{TryRecvError, RecvTimeoutError}`][45506] - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080] - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713] Stabilized APIs --------------- - [`RefCell::replace`] - [`RefCell::swap`] - [`atomic::spin_loop_hint`] The following functions can now be used in a constant expression. eg. `let buffer: [u8; size_of::()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);` - [`AtomicBool::new`][46287] - [`AtomicUsize::new`][46287] - [`AtomicIsize::new`][46287] - [`AtomicPtr::new`][46287] - [`Cell::new`][46287] - [`{integer}::min_value`][46287] - [`{integer}::max_value`][46287] - [`mem::size_of`][46287] - [`mem::align_of`][46287] - [`ptr::null`][46287] - [`ptr::null_mut`][46287] - [`RefCell::new`][46287] - [`UnsafeCell::new`][46287] Cargo ----- - [Added a `workspace.default-members` config that overrides implied `--all` in virtual workspaces.][cargo/4743] - [Enable incremental by default on development builds.][cargo/4817] Also added configuration keys to `Cargo.toml` and `.cargo/config` to disable on a per-project or global basis respectively. Misc ---- Compatibility Notes ------------------- - [Floating point types `Debug` impl now always prints a decimal point.][46831] - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is in accordance with IETF RFC 4291 §2.2. - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833] - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`, `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead. - [Leading zeros in tuple struct members is now an error][47084] - [`column!()` macro is one-based instead of zero-based][46977] - [`fmt::Arguments` can no longer be shared across threads][45198] - [Access to `#[repr(packed)]` struct fields is now unsafe][44884] - [Cargo sets a different working directory for the compiler][cargo/4788] [44884]: https://github.com/rust-lang/rust/pull/44884 [45198]: https://github.com/rust-lang/rust/pull/45198 [45506]: https://github.com/rust-lang/rust/pull/45506 [45990]: https://github.com/rust-lang/rust/pull/45990 [46012]: https://github.com/rust-lang/rust/pull/46012 [46077]: https://github.com/rust-lang/rust/pull/46077 [46094]: https://github.com/rust-lang/rust/pull/46094 [46284]: https://github.com/rust-lang/rust/pull/46284 [46287]: https://github.com/rust-lang/rust/pull/46287 [46293]: https://github.com/rust-lang/rust/pull/46293 [46528]: https://github.com/rust-lang/rust/pull/46528 [46671]: https://github.com/rust-lang/rust/pull/46671 [46713]: https://github.com/rust-lang/rust/pull/46713 [46735]: https://github.com/rust-lang/rust/pull/46735 [46760]: https://github.com/rust-lang/rust/pull/46760 [46798]: https://github.com/rust-lang/rust/pull/46798 [46828]: https://github.com/rust-lang/rust/pull/46828 [46831]: https://github.com/rust-lang/rust/pull/46831 [46833]: https://github.com/rust-lang/rust/pull/46833 [46910]: https://github.com/rust-lang/rust/pull/46910 [46977]: https://github.com/rust-lang/rust/pull/46977 [47018]: https://github.com/rust-lang/rust/pull/47018 [47080]: https://github.com/rust-lang/rust/pull/47080 [47084]: https://github.com/rust-lang/rust/pull/47084 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html Version 1.23.0 (2018-01-04) ========================== Language -------- - [Arbitrary `auto` traits are now permitted in trait objects.][45772] - [rustc now uses subtyping on the left hand side of binary operations.][45435] Which should fix some confusing errors in some operations. Compiler -------- - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of undefined behavior.][45920] - [rustc now suggests renaming import if names clash.][45660] - [Display errors/warnings correctly when there are zero-width or wide characters.][45711] - [rustc now avoids unnecessary copies of arguments that are simple bindings][45380] This should improve memory usage on average by 5-10%. - [Updated musl used to build musl rustc to 1.1.17][45393] Libraries --------- - [Allow a trailing comma in `assert_eq/ne` macro][45887] - [Implement Hash for raw pointers to unsized types][45483] - [impl `From<*mut T>` for `AtomicPtr`][45610] - [impl `From` for `AtomicUsize/AtomicIsize`.][45610] - [Removed the `T: Sync` requirement for `RwLock: Send`][45267] - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref` and `<*mut T>::as_mut`][44932] - [Optimized `Thread::{park, unpark}` implementation][45524] - [Improved `SliceExt::binary_search` performance.][45333] - [impl `FromIterator<()>` for `()`][45379] - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt` is now deprecated. Stabilized APIs --------------- Cargo ----- - [Cargo now supports uninstallation of multiple packages][cargo/4561] eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`. - [Added unit test checking to `cargo check`][cargo/4592] - [Cargo now lets you install a specific version using `cargo install --version`][cargo/4637] Misc ---- - [Releases now ship with the Cargo book documentation.][45692] - [rustdoc now prints rendering warnings on every run.][45324] Compatibility Notes ------------------- - [Changes have been made to type equality to make it more correct, in rare cases this could break some code.][45853] [Tracking issue for further information][45852] - [`char::escape_debug` now uses Unicode 10 over 9.][45571] - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for Android 9, the minimum supported version is Android 14. - [Bumped the minimum LLVM to 3.9][45326] [44042]: https://github.com/rust-lang/rust/pull/44042 [44932]: https://github.com/rust-lang/rust/pull/44932 [45267]: https://github.com/rust-lang/rust/pull/45267 [45324]: https://github.com/rust-lang/rust/pull/45324 [45326]: https://github.com/rust-lang/rust/pull/45326 [45333]: https://github.com/rust-lang/rust/pull/45333 [45379]: https://github.com/rust-lang/rust/pull/45379 [45380]: https://github.com/rust-lang/rust/pull/45380 [45393]: https://github.com/rust-lang/rust/pull/45393 [45435]: https://github.com/rust-lang/rust/pull/45435 [45483]: https://github.com/rust-lang/rust/pull/45483 [45524]: https://github.com/rust-lang/rust/pull/45524 [45571]: https://github.com/rust-lang/rust/pull/45571 [45580]: https://github.com/rust-lang/rust/pull/45580 [45610]: https://github.com/rust-lang/rust/pull/45610 [45660]: https://github.com/rust-lang/rust/pull/45660 [45692]: https://github.com/rust-lang/rust/pull/45692 [45711]: https://github.com/rust-lang/rust/pull/45711 [45772]: https://github.com/rust-lang/rust/pull/45772 [45852]: https://github.com/rust-lang/rust/issues/45852 [45853]: https://github.com/rust-lang/rust/pull/45853 [45887]: https://github.com/rust-lang/rust/pull/45887 [45920]: https://github.com/rust-lang/rust/pull/45920 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637 Version 1.22.1 (2017-11-22) ========================== - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183] [46183]: https://github.com/rust-lang/rust/pull/46183 Version 1.22.0 (2017-11-22) ========================== Language -------- - [`non_snake_case` lint now allows extern no-mangle functions][44966] - [Now accepts underscores in unicode escapes][43716] - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;` - [types that impl `Drop` are now allowed in `const` and `static` types][44456] Compiler -------- - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064] - [rustc will no longer inline in codegen units when compiling for debug][45075] This should decrease compile times for debug builds. - [strict memory alignment now enabled on ARMv6][45094] - [Remove support for the PNaCl target `le32-unknown-nacl`][45041] Libraries --------- - [Allow atomic operations up to 32 bits on `armv5te_unknown_linux_gnueabi`][44978] - [`Box` now impls `From>`][44466] - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095] - [`fs::copy` now returns the length of the main stream on NTFS.][44895] - [Properly detect overflow in `Instant += Duration`.][44220] - [impl `Hasher` for `{&mut Hasher, Box}`][44015] - [impl `fmt::Debug` for `SplitWhitespace`.][44303] - [`Option` now impls `Try`][42526] This allows for using `?` with `Option` types. Stabilized APIs --------------- Cargo ----- - [Cargo will now build multi file examples in subdirectories of the `examples` folder that have a `main.rs` file.][cargo/4496] - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with the old format will continue to work and can be updated with `cargo update`. - [Now supports vendoring git repositories][cargo/3992] Misc ---- - [`libbacktrace` is now available on Apple platforms.][44251] - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949] This now lets you specify that a given code example will fail to compile. Compatibility Notes ------------------- - [The minimum Android version that rustc can build for has been bumped to `4.0` from `2.3`][45656] - [Allowing `T op= &T` for numeric types has broken some type inference cases][45480] [42526]: https://github.com/rust-lang/rust/pull/42526 [43716]: https://github.com/rust-lang/rust/pull/43716 [43949]: https://github.com/rust-lang/rust/pull/43949 [44015]: https://github.com/rust-lang/rust/pull/44015 [44220]: https://github.com/rust-lang/rust/pull/44220 [44251]: https://github.com/rust-lang/rust/pull/44251 [44287]: https://github.com/rust-lang/rust/pull/44287 [44303]: https://github.com/rust-lang/rust/pull/44303 [44456]: https://github.com/rust-lang/rust/pull/44456 [44466]: https://github.com/rust-lang/rust/pull/44466 [44895]: https://github.com/rust-lang/rust/pull/44895 [44966]: https://github.com/rust-lang/rust/pull/44966 [44978]: https://github.com/rust-lang/rust/pull/44978 [45041]: https://github.com/rust-lang/rust/pull/45041 [45064]: https://github.com/rust-lang/rust/pull/45064 [45075]: https://github.com/rust-lang/rust/pull/45075 [45094]: https://github.com/rust-lang/rust/pull/45094 [45095]: https://github.com/rust-lang/rust/pull/45095 [45480]: https://github.com/rust-lang/rust/issues/45480 [45656]: https://github.com/rust-lang/rust/pull/45656 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571 Version 1.21.0 (2017-10-12) ========================== Language -------- - [You can now use static references for literals.][43838] Example: ```rust fn main() { let x: &'static u32 = &0; } ``` - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540] Example: ```rust my_macro!(Vec::new); // Always worked my_macro!(Vec::::new); // Now works ``` Compiler -------- - [Upgraded jemalloc to 4.5.0][43911] - [Enabled unwinding panics on Redox][43917] - [Now runs LLVM in parallel during translation phase.][43506] This should reduce peak memory usage. Libraries --------- - [Generate builtin impls for `Clone` for all arrays and tuples that are `T: Clone`][43690] - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459] - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From`, `From`, `From> where T: ?Sized`, and `From>`.][42565] Stabilized APIs --------------- [`std::mem::discriminant`] Cargo ----- - [You can now call `cargo install` with multiple package names][cargo/4216] - [Cargo commands inside a virtual workspace will now implicitly pass `--all`][cargo/4335] - [Added a `[patch]` section to `Cargo.toml` to handle prepublication dependencies][cargo/4123] [RFC 1969] - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore like patterns][cargo/4270] - [Added the `--all-targets` option][cargo/4400] - [Using required dependencies as a feature is now deprecated and emits a warning][cargo/4364] Misc ---- - [Cargo docs are moving][43916] to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo) - [The rustdoc book is now available][43863] at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc) - [Added a preview of RLS has been made available through rustup][44204] Install with `rustup component add rls-preview` - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348] Previously only showed `std::os::unix`. Compatibility Notes ------------------- - [Changes in method matching against higher-ranked types][43880] This may cause breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880] - [rustc's JSON error output's byte position start at top of file.][42973] Was previously relative to the rustc's internal `CodeMap` struct which required the unstable library `libsyntax` to correctly use. - [`unused_results` lint no longer ignores booleans][43728] [42565]: https://github.com/rust-lang/rust/pull/42565 [42973]: https://github.com/rust-lang/rust/pull/42973 [43348]: https://github.com/rust-lang/rust/pull/43348 [43459]: https://github.com/rust-lang/rust/pull/43459 [43506]: https://github.com/rust-lang/rust/pull/43506 [43540]: https://github.com/rust-lang/rust/pull/43540 [43690]: https://github.com/rust-lang/rust/pull/43690 [43728]: https://github.com/rust-lang/rust/pull/43728 [43838]: https://github.com/rust-lang/rust/pull/43838 [43863]: https://github.com/rust-lang/rust/pull/43863 [43880]: https://github.com/rust-lang/rust/pull/43880 [43911]: https://github.com/rust-lang/rust/pull/43911 [43916]: https://github.com/rust-lang/rust/pull/43916 [43917]: https://github.com/rust-lang/rust/pull/43917 [44204]: https://github.com/rust-lang/rust/pull/44204 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html Version 1.20.0 (2017-08-31) =========================== Language -------- - [Associated constants are now stabilised.][42809] - [A lot of macro bugs are now fixed.][42913] Compiler -------- - [Struct fields are now properly coerced to the expected field type.][42807] - [Enabled wasm LLVM backend][42571] WASM can now be built with the `wasm32-experimental-emscripten` target. - [Changed some of the error messages to be more helpful.][42033] - [Add support for RELRO(RELocation Read-Only) for platforms that support it.][43170] - [rustc now reports the total number of errors on compilation failure][43015] previously this was only the number of errors in the pass that failed. - [Expansion in rustc has been sped up 29x.][42533] - [added `msp430-none-elf` target.][43099] - [rustc will now suggest one-argument enum variant to fix type mismatch when applicable][43178] - [Fixes backtraces on Redox][43228] - [rustc now identifies different versions of same crate when absolute paths of different types match in an error message.][42826] Libraries --------- - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854] - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized tuples.][43011] - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`, `RwLockReadGuard`, `RwLockWriteGuard`][42822] - [Impl `Clone` for `DefaultHasher`.][42799] - [Impl `Sync` for `SyncSender`.][42397] - [Impl `FromStr` for `char`][42271] - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles NaN.][42431] - [allow messages in the `unimplemented!()` macro.][42155] ie. `unimplemented!("Waiting for 1.21 to be stable")` - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185] - [Upgrade to Unicode 10.0.0][42999] - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430] - [Skip the main thread's manual stack guard on Linux][43072] - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077] - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was previously 2^15. - [`{OsStr, Path}::Display` now avoids allocations where possible][42613] Stabilized APIs --------------- - [`CStr::into_c_string`] - [`CString::as_c_str`] - [`CString::into_boxed_c_str`] - [`Chain::get_mut`] - [`Chain::get_ref`] - [`Chain::into_inner`] - [`Option::get_or_insert_with`] - [`Option::get_or_insert`] - [`OsStr::into_os_string`] - [`OsString::into_boxed_os_str`] - [`Take::get_mut`] - [`Take::get_ref`] - [`Utf8Error::error_len`] - [`char::EscapeDebug`] - [`char::escape_debug`] - [`compile_error!`] - [`f32::from_bits`] - [`f32::to_bits`] - [`f64::from_bits`] - [`f64::to_bits`] - [`mem::ManuallyDrop`] - [`slice::sort_unstable_by_key`] - [`slice::sort_unstable_by`] - [`slice::sort_unstable`] - [`str::from_boxed_utf8_unchecked`] - [`str::as_bytes_mut`] - [`str::as_bytes_mut`] - [`str::from_utf8_mut`] - [`str::from_utf8_unchecked_mut`] - [`str::get_mut`] - [`str::get_unchecked_mut`] - [`str::get_unchecked`] - [`str::get`] - [`str::into_boxed_bytes`] Cargo ----- - [Cargo API token location moved from `~/.cargo/config` to `~/.cargo/credentials`.][cargo/3978] - [Cargo will now build `main.rs` binaries that are in sub-directories of `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client` - [You can now specify version of a binary when installed through `cargo install` using `--vers`.][cargo/4229] - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of failure.][cargo/4248] - [Changed the convention around which file is the crate root.][cargo/4259] Compatibility Notes ------------------- - [Functions with `'static` in their return types will now not be as usable as if they were using lifetime parameters instead.][42417] - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now takes the sign of NaN into account where previously didn't.][42430] [42033]: https://github.com/rust-lang/rust/pull/42033 [42155]: https://github.com/rust-lang/rust/pull/42155 [42271]: https://github.com/rust-lang/rust/pull/42271 [42397]: https://github.com/rust-lang/rust/pull/42397 [42417]: https://github.com/rust-lang/rust/pull/42417 [42430]: https://github.com/rust-lang/rust/pull/42430 [42431]: https://github.com/rust-lang/rust/pull/42431 [42533]: https://github.com/rust-lang/rust/pull/42533 [42571]: https://github.com/rust-lang/rust/pull/42571 [42613]: https://github.com/rust-lang/rust/pull/42613 [42799]: https://github.com/rust-lang/rust/pull/42799 [42807]: https://github.com/rust-lang/rust/pull/42807 [42809]: https://github.com/rust-lang/rust/pull/42809 [42822]: https://github.com/rust-lang/rust/pull/42822 [42826]: https://github.com/rust-lang/rust/pull/42826 [42854]: https://github.com/rust-lang/rust/pull/42854 [42913]: https://github.com/rust-lang/rust/pull/42913 [42999]: https://github.com/rust-lang/rust/pull/42999 [43011]: https://github.com/rust-lang/rust/pull/43011 [43015]: https://github.com/rust-lang/rust/pull/43015 [43072]: https://github.com/rust-lang/rust/pull/43072 [43077]: https://github.com/rust-lang/rust/pull/43077 [43097]: https://github.com/rust-lang/rust/pull/43097 [43099]: https://github.com/rust-lang/rust/pull/43099 [43170]: https://github.com/rust-lang/rust/pull/43170 [43178]: https://github.com/rust-lang/rust/pull/43178 [43185]: https://github.com/rust-lang/rust/pull/43185 [43228]: https://github.com/rust-lang/rust/pull/43228 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes Version 1.19.0 (2017-07-20) =========================== Language -------- - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506] For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`. - [Macro recursion limit increased to 1024 from 64.][41676] - [Added lint for detecting unused macros.][41907] - [`loop` can now return a value with `break`.][42016] [RFC 1624] For example: `let x = loop { break 7; };` - [C compatible `union`s are now available.][42068] [RFC 1444] They can only contain `Copy` types and cannot have a `Drop` implementation. Example: `union Foo { bar: u8, baz: usize }` - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558] Example: `let foo: fn(u8) -> u8 = |v: u8| { v };` Compiler -------- - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370] - [Change `arm-linux-androideabi` to correspond to the `armeabi` official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI you should use `--target armv7-linux-androideabi`. - [Fixed ICE when removing a source file between compilation sessions.][41873] - [Minor optimisation of string operations.][42037] - [Compiler error message is now `aborting due to previous error(s)` instead of `aborting due to N previous errors`][42150] This was previously inaccurate and would only count certain kinds of errors. - [The compiler now supports Visual Studio 2017][42225] - [The compiler is now built against LLVM 4.0.1 by default][42948] - [Added a lot][42264] of [new error codes][42302] - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows libraries with C Run-time Libraries(CRT) to be statically linked. - [Fixed various ARM codegen bugs][42740] Libraries --------- - [`String` now implements `FromIterator>` and `Extend>`][41449] - [`Vec` now implements `From<&mut [T]>`][41530] - [`Box<[u8]>` now implements `From>`][41258] - [`SplitWhitespace` now implements `Clone`][41659] - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now 1.5x faster][41764] - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!` macros, but for printing to stderr. Stabilized APIs --------------- - [`OsString::shrink_to_fit`] - [`cmp::Reverse`] - [`Command::envs`] - [`thread::ThreadId`] Cargo ----- - [Build scripts can now add environment variables to the environment the crate is being compiled in. Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929] - [Subcommands now replace the current process rather than spawning a new child process][cargo/3970] - [Workspace members can now accept glob file patterns][cargo/3979] - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all the members in a given workspace.][cargo/3988] - [Updated `libssh2-sys` to 0.2.6][cargo/4008] - [Target directory path is now in the cargo metadata][cargo/4022] - [Cargo no longer checks out a local working directory for the crates.io index][cargo/4026] This should provide smaller file size for the registry, and improve cloning times, especially on Windows machines. - [Added an `--exclude` option for excluding certain packages when using the `--all` option][cargo/4031] - [Cargo will now automatically retry when receiving a 5xx error from crates.io][cargo/4032] - [The `--features` option now accepts multiple comma or space delimited values.][cargo/4084] - [Added support for custom target specific runners][cargo/3954] Misc ---- - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the Windows Debugger. - [Rust will now release XZ compressed packages][rust-installer/57] - [rustup will now prefer to download rust packages with XZ compression][rustup/1100] over GZip packages. - [Added the ability to escape `#` in rust documentation][41785] By adding additional `#`'s ie. `##` is now `#` Compatibility Notes ------------------- - [`MutexGuard` may only be `Sync` if `T` is `Sync`.][41624] - [`-Z` flags are now no longer allowed to be used on the stable compiler.][41751] This has been a warning for a year previous to this. - [As a result of the `-Z` flag change, the `cargo-check` plugin no longer works][42844]. Users should migrate to the built-in `check` command, which has been available since 1.16. - [Ending a float literal with `._` is now a hard error. Example: `42._` .][41946] - [Any use of a private `extern crate` outside of its module is now a hard error.][36886] This was previously a warning. - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always relative while the `::` prefix makes a path absolute, but was ignored and the path was relative regardless. - [Floating point constants in match patterns is now a hard error][36890] This was previously a warning. - [Struct or enum constants that don't derive `PartialEq` & `Eq` used match patterns is now a hard error][36891] This was previously a warning. - [Lifetimes named `'_` are no longer allowed.][36892] This was previously a warning. - [From the pound escape, lines consisting of multiple `#`s are now visible][41785] - [It is an error to re-export private enum variants][42460]. This is known to break a number of crates that depend on an older version of mustache. - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try to use it to find the linker, and the build will fail where it did not previously][42607] [36886]: https://github.com/rust-lang/rust/issues/36886 [36888]: https://github.com/rust-lang/rust/issues/36888 [36890]: https://github.com/rust-lang/rust/issues/36890 [36891]: https://github.com/rust-lang/rust/issues/36891 [36892]: https://github.com/rust-lang/rust/issues/36892 [37406]: https://github.com/rust-lang/rust/issues/37406 [39983]: https://github.com/rust-lang/rust/pull/39983 [41145]: https://github.com/rust-lang/rust/pull/41145 [41192]: https://github.com/rust-lang/rust/pull/41192 [41258]: https://github.com/rust-lang/rust/pull/41258 [41370]: https://github.com/rust-lang/rust/pull/41370 [41449]: https://github.com/rust-lang/rust/pull/41449 [41530]: https://github.com/rust-lang/rust/pull/41530 [41624]: https://github.com/rust-lang/rust/pull/41624 [41656]: https://github.com/rust-lang/rust/pull/41656 [41659]: https://github.com/rust-lang/rust/pull/41659 [41676]: https://github.com/rust-lang/rust/pull/41676 [41751]: https://github.com/rust-lang/rust/pull/41751 [41764]: https://github.com/rust-lang/rust/pull/41764 [41785]: https://github.com/rust-lang/rust/pull/41785 [41873]: https://github.com/rust-lang/rust/pull/41873 [41907]: https://github.com/rust-lang/rust/pull/41907 [41946]: https://github.com/rust-lang/rust/pull/41946 [42016]: https://github.com/rust-lang/rust/pull/42016 [42037]: https://github.com/rust-lang/rust/pull/42037 [42068]: https://github.com/rust-lang/rust/pull/42068 [42150]: https://github.com/rust-lang/rust/pull/42150 [42162]: https://github.com/rust-lang/rust/pull/42162 [42225]: https://github.com/rust-lang/rust/pull/42225 [42264]: https://github.com/rust-lang/rust/pull/42264 [42302]: https://github.com/rust-lang/rust/pull/42302 [42460]: https://github.com/rust-lang/rust/issues/42460 [42607]: https://github.com/rust-lang/rust/issues/42607 [42740]: https://github.com/rust-lang/rust/pull/42740 [42844]: https://github.com/rust-lang/rust/issues/42844 [42948]: https://github.com/rust-lang/rust/pull/42948 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100 Version 1.18.0 (2017-06-08) =========================== Language -------- - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to make the item visible to just that module tree. Also accepts the keyword `crate` to make something public to the whole crate but not users of the library. Example: `pub(crate) mod utils;`. [RFC 1422]. - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665]. - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept types like `Write + Send`, trailing `+` are now supported in trait objects, and better error reporting for trait objects starting with `?Sized`. - [0e+10 is now a valid floating point literal][40589] - [Now warns if you bind a lifetime parameter to 'static][40734] - [Tuples, Enum variant fields, and structs with no `repr` attribute or with `#[repr(Rust)]` are reordered to minimize padding and produce a smaller representation in some cases.][40377] Compiler -------- - [rustc can now emit mir with `--emit mir`][39891] - [Improved LLVM IR for trivial functions][40367] - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723] - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation opportunities found through profiling - [Improved backtrace formatting when panicking][38165] Libraries --------- - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the iterator hasn't been advanced the original `Vec` is reassembled with no actual iteration or reallocation. - [Simplified HashMap Bucket interface][40561] provides performance improvements for iterating and cloning. - [Specialize Vec::from_elem to use calloc][40409] - [Fixed Race condition in fs::create_dir_all][39799] - [No longer caching stdio on Windows][40516] - [Optimized insertion sort in slice][40807] insertion sort in some cases 2.50%~ faster and in one case now 12.50% faster. - [Optimized `AtomicBool::fetch_nand`][41143] Stabilized APIs --------------- - [`Child::try_wait`] - [`HashMap::retain`] - [`HashSet::retain`] - [`PeekMut::pop`] - [`TcpStream::peek`] - [`UdpSocket::peek`] - [`UdpSocket::peek_from`] Cargo ----- - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust. You can now create new cargo projects with Pijul using `cargo new --vcs pijul` - [Now always emits build script warnings for crates that fail to build][cargo/3847] - [Added Android build support][cargo/3885] - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs of a certain type, for example `cargo build --bins` will build all binaries. - [Added support for haiku][cargo/3952] Misc ---- - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338] - [Rust now uses the official cross compiler for NetBSD][40612] - [rustdoc now accepts `#` at the start of files][40828] - [Fixed jemalloc support for musl][41168] Compatibility Notes ------------------- - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now always placed after the sign if it exists and before the digits. With the `#` flag the zeroes are placed after the prefix and before the digits. - [Due to the struct field optimisation][40377], using `transmute` on structs that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has always been undefined behavior, but is now more likely to break in practice. - [The refactor of trait object type parsing][40043] fixed a bug where `+` was receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send` - [Overlapping inherent `impl`s are now a hard error][40728] - [`PartialOrd` and `Ord` must agree on the ordering.][41270] - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output `out.asm` and `out.ll` instead of only one of the filetypes. - [ calling a function that returns `Self` will no longer work][41805] when the size of `Self` cannot be statically determined. - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805] this has caused a few regressions namely: - Changed the link order of local static/dynamic libraries (respecting the order on given rather than having the compiler reorder). - Changed how MinGW is linked, native code linked to dynamic libraries may require manually linking to the gcc support library (for the native code itself) [38165]: https://github.com/rust-lang/rust/pull/38165 [39799]: https://github.com/rust-lang/rust/pull/39799 [39891]: https://github.com/rust-lang/rust/pull/39891 [40043]: https://github.com/rust-lang/rust/pull/40043 [40241]: https://github.com/rust-lang/rust/pull/40241 [40338]: https://github.com/rust-lang/rust/pull/40338 [40367]: https://github.com/rust-lang/rust/pull/40367 [40377]: https://github.com/rust-lang/rust/pull/40377 [40409]: https://github.com/rust-lang/rust/pull/40409 [40516]: https://github.com/rust-lang/rust/pull/40516 [40556]: https://github.com/rust-lang/rust/pull/40556 [40561]: https://github.com/rust-lang/rust/pull/40561 [40589]: https://github.com/rust-lang/rust/pull/40589 [40612]: https://github.com/rust-lang/rust/pull/40612 [40723]: https://github.com/rust-lang/rust/pull/40723 [40728]: https://github.com/rust-lang/rust/pull/40728 [40731]: https://github.com/rust-lang/rust/pull/40731 [40734]: https://github.com/rust-lang/rust/pull/40734 [40805]: https://github.com/rust-lang/rust/pull/40805 [40807]: https://github.com/rust-lang/rust/pull/40807 [40828]: https://github.com/rust-lang/rust/pull/40828 [40870]: https://github.com/rust-lang/rust/pull/40870 [41085]: https://github.com/rust-lang/rust/pull/41085 [41143]: https://github.com/rust-lang/rust/pull/41143 [41168]: https://github.com/rust-lang/rust/pull/41168 [41270]: https://github.com/rust-lang/rust/issues/41270 [41469]: https://github.com/rust-lang/rust/pull/41469 [41805]: https://github.com/rust-lang/rust/issues/41805 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952 Version 1.17.0 (2017-04-27) =========================== Language -------- * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623] * [Fields of structs may be initialized without duplicating the field/variable names][39761]. [RFC 1682] * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647] * [When coercing to an unsized type lifetimes must be equal][40319]. That is, there is no subtyping between `T` and `U` when `T: Unsize`. For example, coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness fix. * [Values passed to the indexing operator, `[]`, automatically coerce][40166] * [Static variables may contain references to other statics][40027] Compiler -------- * [Exit quickly on only `--emit dep-info`][40336] * [Make `-C relocation-model` more correctly determine whether the linker creates a position-independent executable][40245] * [Add `-C overflow-checks` to directly control whether integer overflow panics][40037] * [The rustc type checker now checks items on demand instead of in a single in-order pass][40008]. This is mostly an internal refactoring in support of future work, including incremental type checking, but also resolves [RFC 1647], allowing `Self` to appear in `impl` `where` clauses. * [Optimize vtable loads][39995] * [Turn off vectorization for Emscripten targets][39990] * [Provide suggestions for unknown macros imported with `use`][39953] * [Fix ICEs in path resolution][39939] * [Strip exception handling code on Emscripten when `panic=abort`][39193] * [Add clearer error message using `&str + &str`][39116] Stabilized APIs --------------- * [`Arc::into_raw`] * [`Arc::from_raw`] * [`Arc::ptr_eq`] * [`Rc::into_raw`] * [`Rc::from_raw`] * [`Rc::ptr_eq`] * [`Ordering::then`] * [`Ordering::then_with`] * [`BTreeMap::range`] * [`BTreeMap::range_mut`] * [`collections::Bound`] * [`process::abort`] * [`ptr::read_unaligned`] * [`ptr::write_unaligned`] * [`Result::expect_err`] * [`Cell::swap`] * [`Cell::replace`] * [`Cell::into_inner`] * [`Cell::take`] Libraries --------- * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787] * [`Cell` can store non-`Copy` types][39793]. [RFC 1651] * [`String` implements `FromIterator<&char>`][40028] * `Box` [implements][40009] a number of new conversions: `From> for String`, `From> for Vec`, `From> for CString`, `From> for OsString`, `From> for PathBuf`, `Into> for String`, `Into> for Vec`, `Into> for CString`, `Into> for OsString`, `Into> for PathBuf`, `Default for Box`, `Default for Box`, `Default for Box`, `From<&CStr> for Box`, `From<&OsStr> for Box`, `From<&Path> for Box` * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960] * [Specialize `PartialOrd for [A] where A: Ord`][39642] * [Slightly optimize `slice::sort`][39538] * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440] * [`Box<[T]>` implements `From<&[T]> where T: Copy`, `Box` implements `From<&str>`][39438] * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements `From<(I, u16)> where I: Into`][39372] * [`format!` estimates the needed capacity before writing a string][39356] * [Support unprivileged symlink creation in Windows][38921] * [`PathBuf` implements `Default`][38764] * [Implement `PartialEq<[A]>` for `VecDeque`][38661] * [`HashMap` resizes adaptively][38368] to guard against DOS attacks and poor hash functions. Cargo ----- * [Add `cargo check --all`][cargo/3731] * [Add an option to ignore SSL revocation checking][cargo/3699] * [Add `cargo run --package`][cargo/3691] * [Add `required_features`][cargo/3667] * [Assume `build.rs` is a build script][cargo/3664] * [Find workspace via `workspace_root` link in containing member][cargo/3562] Misc ---- * [Documentation is rendered with mdbook instead of the obsolete, in-tree `rustbook`][39633] * [The "Unstable Book" documents nightly-only features][ubook] * [Improve the style of the sidebar in rustdoc output][40265] * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261] * [Fix MSP430 breakage due to `i128`][40257] * [Preliminary Solaris/SPARCv9 support][39903] * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to run without installing the MSVC runtime. * [`rustdoc --test` includes file names in test names][39788] * This release includes builds of `std` for `sparc64-unknown-linux-gnu`, `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`. * [Initial support for `aarch64-unknown-freebsd`][39491] * [Initial support for `i686-unknown-netbsd`][39426] * [This release no longer includes the old makefile build system][39431]. Rust is built with a custom build system, written in Rust, and with Cargo. * [Add Debug implementations for libcollection structs][39002] * [`TypeId` implements `PartialOrd` and `Ord`][38981] * [`--test-threads=0` produces an error][38945] * [`rustup` installs documentation by default][40526] * [The Rust source includes NatVis visualizations][39843]. These can be used by WinDbg and Visual Studio to improve the debugging experience. Compatibility Notes ------------------- * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a workaround, either use MSVC 2015 or run vcvars.bat. * [When coercing to an unsized type lifetimes must be equal][40319]. That is, disallow subtyping between `T` and `U` when `T: Unsize`, e.g. coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness fix. * [`format!` and `Display::to_string` panic if an underlying formatting implementation returns an error][40117]. Previously the error was silently ignored. It is incorrect for `write_fmt` to return an error when writing to a string. * [In-tree crates are verified to be unstable][39851]. Previously, some minor crates were marked stable and could be accessed from the stable toolchain. * [Rust git source no longer includes vendored crates][39728]. Those that need to build with vendored crates should build from release tarballs. * [Fix inert attributes from `proc_macro_derives`][39572] * [During crate resolution, rustc prefers a crate in the sysroot if two crates are otherwise identical][39518]. Unlikely to be encountered outside the Rust build system. * [Fixed bugs around how type inference interacts with dead-code][39485]. The existing code generally ignores the type of dead-code unless a type-hint is provided; this can cause surprising inference interactions particularly around defaulting. The new code uniformly ignores the result type of dead-code. * [Tuple-struct constructors with private fields are no longer visible][38932] * [Lifetime parameters that do not appear in the arguments are now considered early-bound][38897], resolving a soundness bug (#[32330]). The `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since April of 2016. * [rustdoc: fix doctests with non-feature crate attributes][38161] * [Make transmuting from fn item types to pointer-sized types a hard error][34198] [27787]: https://github.com/rust-lang/rust/issues/27787 [32330]: https://github.com/rust-lang/rust/issues/32330 [34198]: https://github.com/rust-lang/rust/pull/34198 [38161]: https://github.com/rust-lang/rust/pull/38161 [38368]: https://github.com/rust-lang/rust/pull/38368 [38584]: https://github.com/rust-lang/rust/issues/38584 [38661]: https://github.com/rust-lang/rust/pull/38661 [38764]: https://github.com/rust-lang/rust/pull/38764 [38864]: https://github.com/rust-lang/rust/issues/38864 [38897]: https://github.com/rust-lang/rust/pull/38897 [38921]: https://github.com/rust-lang/rust/pull/38921 [38932]: https://github.com/rust-lang/rust/pull/38932 [38945]: https://github.com/rust-lang/rust/pull/38945 [38981]: https://github.com/rust-lang/rust/pull/38981 [39002]: https://github.com/rust-lang/rust/pull/39002 [39116]: https://github.com/rust-lang/rust/pull/39116 [39193]: https://github.com/rust-lang/rust/pull/39193 [39265]: https://github.com/rust-lang/rust/pull/39265 [39356]: https://github.com/rust-lang/rust/pull/39356 [39372]: https://github.com/rust-lang/rust/pull/39372 [39426]: https://github.com/rust-lang/rust/pull/39426 [39431]: https://github.com/rust-lang/rust/pull/39431 [39438]: https://github.com/rust-lang/rust/pull/39438 [39440]: https://github.com/rust-lang/rust/pull/39440 [39485]: https://github.com/rust-lang/rust/pull/39485 [39491]: https://github.com/rust-lang/rust/pull/39491 [39518]: https://github.com/rust-lang/rust/pull/39518 [39538]: https://github.com/rust-lang/rust/pull/39538 [39572]: https://github.com/rust-lang/rust/pull/39572 [39633]: https://github.com/rust-lang/rust/pull/39633 [39642]: https://github.com/rust-lang/rust/pull/39642 [39728]: https://github.com/rust-lang/rust/pull/39728 [39761]: https://github.com/rust-lang/rust/pull/39761 [39788]: https://github.com/rust-lang/rust/pull/39788 [39793]: https://github.com/rust-lang/rust/pull/39793 [39837]: https://github.com/rust-lang/rust/pull/39837 [39843]: https://github.com/rust-lang/rust/pull/39843 [39851]: https://github.com/rust-lang/rust/pull/39851 [39903]: https://github.com/rust-lang/rust/pull/39903 [39939]: https://github.com/rust-lang/rust/pull/39939 [39953]: https://github.com/rust-lang/rust/pull/39953 [39960]: https://github.com/rust-lang/rust/pull/39960 [39990]: https://github.com/rust-lang/rust/pull/39990 [39995]: https://github.com/rust-lang/rust/pull/39995 [40008]: https://github.com/rust-lang/rust/pull/40008 [40009]: https://github.com/rust-lang/rust/pull/40009 [40027]: https://github.com/rust-lang/rust/pull/40027 [40028]: https://github.com/rust-lang/rust/pull/40028 [40037]: https://github.com/rust-lang/rust/pull/40037 [40117]: https://github.com/rust-lang/rust/pull/40117 [40166]: https://github.com/rust-lang/rust/pull/40166 [40245]: https://github.com/rust-lang/rust/pull/40245 [40257]: https://github.com/rust-lang/rust/pull/40257 [40261]: https://github.com/rust-lang/rust/pull/40261 [40265]: https://github.com/rust-lang/rust/pull/40265 [40319]: https://github.com/rust-lang/rust/pull/40319 [40336]: https://github.com/rust-lang/rust/pull/40336 [40526]: https://github.com/rust-lang/rust/pull/40526 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731 [ubook]: https://doc.rust-lang.org/unstable-book/ Version 1.16.0 (2017-03-16) =========================== Language -------- * [The compiler's `dead_code` lint now accounts for type aliases][38051]. * [Uninhabitable enums (those without any variants) no longer permit wildcard match patterns][38069] * [Clean up semantics of `self` in an import list][38313] * [`Self` may appear in `impl` headers][38920] * [`Self` may appear in struct expressions][39282] Compiler -------- * [`rustc` now supports `--emit=metadata`, which causes rustc to emit a `.rmeta` file containing only crate metadata][38571]. This can be used by tools like the Rust Language Service to perform metadata-only builds. * [Levenshtein based typo suggestions now work in most places, while previously they worked only for fields and sometimes for local variables][38927]. Together with the overhaul of "no resolution"/"unexpected resolution" errors (#[38154]) they result in large and systematic improvement in resolution diagnostics. * [Fix `transmute::` where `T` requires a bigger alignment than `U`][38670] * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798] * [`rustc` no longer attempts to provide "consider using an explicit lifetime" suggestions][37057]. They were inaccurate. Stabilized APIs --------------- * [`VecDeque::truncate`] * [`VecDeque::resize`] * [`String::insert_str`] * [`Duration::checked_add`] * [`Duration::checked_sub`] * [`Duration::checked_div`] * [`Duration::checked_mul`] * [`str::replacen`] * [`str::repeat`] * [`SocketAddr::is_ipv4`] * [`SocketAddr::is_ipv6`] * [`IpAddr::is_ipv4`] * [`IpAddr::is_ipv6`] * [`Vec::dedup_by`] * [`Vec::dedup_by_key`] * [`Result::unwrap_or_default`] * [`<*const T>::wrapping_offset`] * [`<*mut T>::wrapping_offset`] * `CommandExt::creation_flags` * [`File::set_permissions`] * [`String::split_off`] Libraries --------- * [`[T]::binary_search` and `[T]::binary_search_by_key` now take their argument by `Borrow` parameter][37761] * [All public types in std implement `Debug`][38006] * [`IpAddr` implements `From` and `From`][38327] * [`Ipv6Addr` implements `From<[u16; 8]>`][38131] * [Ctrl-Z returns from `Stdin.read()` when reading from the console on Windows][38274] * [std: Fix partial writes in `LineWriter`][38062] * [std: Clamp max read/write sizes on Unix][38622] * [Use more specific panic message for `&str` slicing errors][38066] * [`TcpListener::set_only_v6` is deprecated][38304]. This functionality cannot be achieved in std currently. * [`writeln!`, like `println!`, now accepts a form with no string or formatting arguments, to just print a newline][38469] * [Implement `iter::Sum` and `iter::Product` for `Result`][38580] * [Reduce the size of static data in `std_unicode::tables`][38781] * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`, `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement `Display`][38909] * [`Duration` implements `Sum`][38712] * [`String` implements `ToSocketAddrs`][39048] Cargo ----- * [The `cargo check` command does a type check of a project without building it][cargo/3296] * [crates.io will display CI badges from Travis and AppVeyor, if specified in Cargo.toml][cargo/3546] * [crates.io will display categories listed in Cargo.toml][cargo/3301] * [Compilation profiles accept integer values for `debug`, in addition to `true` and `false`. These are passed to `rustc` as the value to `-C debuginfo`][cargo/3534] * [Implement `cargo --version --verbose`][cargo/3604] * [All builds now output 'dep-info' build dependencies compatible with make and ninja][cargo/3557] * [Build all workspace members with `build --all`][cargo/3511] * [Document all workspace members with `doc --all`][cargo/3515] * [Path deps outside workspace are not members][cargo/3443] Misc ---- * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies the path to the Rust implementation][38589] * [The `armv7-linux-androideabi` target no longer enables NEON extensions, per Google's ABI guide][38413] * [The stock standard library can be compiled for Redox OS][38401] * [Rust has initial SPARC support][38726]. Tier 3. No builds available. * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No builds available. * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379] Compatibility Notes ------------------- * [Uninhabitable enums (those without any variants) no longer permit wildcard match patterns][38069] * In this release, references to uninhabited types can not be pattern-matched. This was accidentally allowed in 1.15. * [The compiler's `dead_code` lint now accounts for type aliases][38051]. * [Ctrl-Z returns from `Stdin.read()` when reading from the console on Windows][38274] * [Clean up semantics of `self` in an import list][38313] * Reimplemented lifetime elision. This change was almost entirely compatible with existing code, but it did close a number of small bugs and loopholes, as well as being more accepting in some other [cases][41105]. [37057]: https://github.com/rust-lang/rust/pull/37057 [37761]: https://github.com/rust-lang/rust/pull/37761 [38006]: https://github.com/rust-lang/rust/pull/38006 [38051]: https://github.com/rust-lang/rust/pull/38051 [38062]: https://github.com/rust-lang/rust/pull/38062 [38622]: https://github.com/rust-lang/rust/pull/38622 [38066]: https://github.com/rust-lang/rust/pull/38066 [38069]: https://github.com/rust-lang/rust/pull/38069 [38131]: https://github.com/rust-lang/rust/pull/38131 [38154]: https://github.com/rust-lang/rust/pull/38154 [38274]: https://github.com/rust-lang/rust/pull/38274 [38304]: https://github.com/rust-lang/rust/pull/38304 [38313]: https://github.com/rust-lang/rust/pull/38313 [38327]: https://github.com/rust-lang/rust/pull/38327 [38401]: https://github.com/rust-lang/rust/pull/38401 [38413]: https://github.com/rust-lang/rust/pull/38413 [38469]: https://github.com/rust-lang/rust/pull/38469 [38559]: https://github.com/rust-lang/rust/pull/38559 [38571]: https://github.com/rust-lang/rust/pull/38571 [38580]: https://github.com/rust-lang/rust/pull/38580 [38589]: https://github.com/rust-lang/rust/pull/38589 [38670]: https://github.com/rust-lang/rust/pull/38670 [38712]: https://github.com/rust-lang/rust/pull/38712 [38726]: https://github.com/rust-lang/rust/pull/38726 [38781]: https://github.com/rust-lang/rust/pull/38781 [38798]: https://github.com/rust-lang/rust/pull/38798 [38909]: https://github.com/rust-lang/rust/pull/38909 [38920]: https://github.com/rust-lang/rust/pull/38920 [38927]: https://github.com/rust-lang/rust/pull/38927 [39048]: https://github.com/rust-lang/rust/pull/39048 [39282]: https://github.com/rust-lang/rust/pull/39282 [39379]: https://github.com/rust-lang/rust/pull/39379 [41105]: https://github.com/rust-lang/rust/issues/41105 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset-1 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604 Version 1.15.1 (2017-02-09) =========================== * [Fix IntoIter::as_mut_slice's signature][39466] * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523] [39466]: https://github.com/rust-lang/rust/pull/39466 [39523]: https://github.com/rust-lang/rust/pull/39523 Version 1.15.0 (2017-02-02) =========================== Language -------- * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are stable. This allows popular code-generating crates like Serde and Diesel to work ergonomically. [RFC 1681]. * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated with curly braces][36868]. Part of [RFC 1506]. * [A number of minor changes to name resolution have been activated][37127]. They add up to more consistent semantics, allowing for future evolution of Rust macros. Specified in [RFC 1560], see its section on ["changes"] for details of what is different. The breaking changes here have been transitioned through the [`legacy_imports`] lint since 1.14, with no known regressions. * [In `macro_rules`, `path` fragments can now be parsed as type parameter bounds][38279] * [`?Sized` can be used in `where` clauses][37791] * [There is now a limit on the size of monomorphized types and it can be modified with the `#![type_size_limit]` crate attribute, similarly to the `#![recursion_limit]` attribute][37789] Compiler -------- * [On Windows, the compiler will apply dllimport attributes when linking to extern functions][37973]. Additional attributes and flags can control which library kind is linked and its name. [RFC 1717]. * [Rust-ABI symbols are no longer exported from cdylibs][38117] * [The `--test` flag works with procedural macro crates][38107] * [Fix `extern "aapcs" fn` ABI][37814] * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing. * [The `format!` expander recognizes incorrect `printf` and shell-style formatting directives and suggests the correct format][37613]. * [Only report one error for all unused imports in an import list][37456] Compiler Performance -------------------- * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705] * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979] * [Don't clone in `UnificationTable::probe`][37848] * [Remove `scope_auxiliary` to cut RSS by 10%][37764] * [Use small vectors in type walker][37760] * [Macro expansion performance was improved][37701] * [Change `HirVec>` to `HirVec` in `hir::Expr`][37642] * [Replace FNV with a faster hash function][37229] Stabilized APIs --------------- * [`std::iter::Iterator::min_by`] * [`std::iter::Iterator::max_by`] * [`std::os::*::fs::FileExt`] * [`std::sync::atomic::Atomic*::get_mut`] * [`std::sync::atomic::Atomic*::into_inner`] * [`std::vec::IntoIter::as_slice`] * [`std::vec::IntoIter::as_mut_slice`] * [`std::sync::mpsc::Receiver::try_iter`] * [`std::os::unix::process::CommandExt::before_exec`] * [`std::rc::Rc::strong_count`] * [`std::rc::Rc::weak_count`] * [`std::sync::Arc::strong_count`] * [`std::sync::Arc::weak_count`] * [`std::char::encode_utf8`] * [`std::char::encode_utf16`] * [`std::cell::Ref::clone`] * [`std::io::Take::into_inner`] Libraries --------- * [The standard sorting algorithm has been rewritten for dramatic performance improvements][38192]. It is a hybrid merge sort, drawing influences from Timsort. Previously it was a naive merge sort. * [`Iterator::nth` no longer has a `Sized` bound][38134] * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve performance. * [`chars().count()` is much faster][37888] and so are [`chars().last()` and `char_indices().last()`][37882] * [Fix ARM Objective-C ABI in `std::env::args`][38146] * [Chinese characters display correctly in `fmt::Debug`][37855] * [Derive `Default` for `Duration`][37699] * [Support creation of anonymous pipes on WinXP/2k][37677] * [`mpsc::RecvTimeoutError` implements `Error`][37527] * [Don't pass overlapped handles to processes][38835] Cargo ----- * [In this release, Cargo build scripts no longer have access to the `OUT_DIR` environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They should instead check the variable at runtime with `std::env`. That the value was set at build time was a bug, and incorrect when cross-compiling. This change is known to cause breakage. * [Add `--all` flag to `cargo test`][cargo/3221] * [Compile statically against the MSVC CRT][cargo/3363] * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102] * [Link OpenSSL statically on OSX][cargo/3311] * [Apply new fingerprinting to build dir outputs][cargo/3310] * [Test for bad path overrides with summaries][cargo/3336] * [Require `cargo install --vers` to take a semver version][cargo/3338] * [Fix retrying crate downloads for network errors][cargo/3348] * [Implement string lookup for `build.rustflags` config key][cargo/3356] * [Emit more info on --message-format=json][cargo/3319] * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361] * [Don't ignore errors in workspace manifest][cargo/3409] * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410] Tooling ------- * [Test runners (binaries built with `--test`) now support a `--list` argument that lists the tests it contains][38185] * [Test runners now support a `--exact` argument that makes the test filter match exactly, instead of matching only a substring of the test name][38181] * [rustdoc supports a `--playground-url` flag][37763] * [rustdoc provides more details about `#[should_panic]` errors][37749] Misc ---- * [The Rust build system is now written in Rust][37817]. The Makefiles may continue to be used in this release by passing `--disable-rustbuild` to the configure script, but they will be deleted soon. Note that the new build system uses a different on-disk layout that will likely affect any scripts building Rust. * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or releases. * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases. * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or releases. Compatibility Notes ------------------- * [A number of minor changes to name resolution have been activated][37127]. They add up to more consistent semantics, allowing for future evolution of Rust macros. Specified in [RFC 1560], see its section on ["changes"] for details of what is different. The breaking changes here have been transitioned through the [`legacy_imports`] lint since 1.14, with no known regressions. * [In this release, Cargo build scripts no longer have access to the `OUT_DIR` environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They should instead check the variable at runtime with `std::env`. That the value was set at build time was a bug, and incorrect when cross-compiling. This change is known to cause breakage. * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since 1.10 and is now an error by default. It will become a hard error in the near future. * [The semantics relating modules to file system directories are changing in minor ways][37602]. This is captured in the new `legacy_directory_ownership` lint, which is a warning in this release, and will become a hard error in the future. * [Rust-ABI symbols are no longer exported from cdylibs][38117] * [Once `Peekable` peeks a `None` it will return that `None` without re-querying the underlying iterator][37834] ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules [33685]: https://github.com/rust-lang/rust/issues/33685 [36868]: https://github.com/rust-lang/rust/pull/36868 [37127]: https://github.com/rust-lang/rust/pull/37127 [37229]: https://github.com/rust-lang/rust/pull/37229 [37456]: https://github.com/rust-lang/rust/pull/37456 [37527]: https://github.com/rust-lang/rust/pull/37527 [37602]: https://github.com/rust-lang/rust/pull/37602 [37613]: https://github.com/rust-lang/rust/pull/37613 [37615]: https://github.com/rust-lang/rust/pull/37615 [37636]: https://github.com/rust-lang/rust/pull/37636 [37627]: https://github.com/rust-lang/rust/pull/37627 [37642]: https://github.com/rust-lang/rust/pull/37642 [37677]: https://github.com/rust-lang/rust/pull/37677 [37699]: https://github.com/rust-lang/rust/pull/37699 [37701]: https://github.com/rust-lang/rust/pull/37701 [37705]: https://github.com/rust-lang/rust/pull/37705 [37749]: https://github.com/rust-lang/rust/pull/37749 [37760]: https://github.com/rust-lang/rust/pull/37760 [37763]: https://github.com/rust-lang/rust/pull/37763 [37764]: https://github.com/rust-lang/rust/pull/37764 [37789]: https://github.com/rust-lang/rust/pull/37789 [37791]: https://github.com/rust-lang/rust/pull/37791 [37814]: https://github.com/rust-lang/rust/pull/37814 [37817]: https://github.com/rust-lang/rust/pull/37817 [37834]: https://github.com/rust-lang/rust/pull/37834 [37848]: https://github.com/rust-lang/rust/pull/37848 [37855]: https://github.com/rust-lang/rust/pull/37855 [37882]: https://github.com/rust-lang/rust/pull/37882 [37888]: https://github.com/rust-lang/rust/pull/37888 [37973]: https://github.com/rust-lang/rust/pull/37973 [37979]: https://github.com/rust-lang/rust/pull/37979 [38086]: https://github.com/rust-lang/rust/pull/38086 [38107]: https://github.com/rust-lang/rust/pull/38107 [38117]: https://github.com/rust-lang/rust/pull/38117 [38134]: https://github.com/rust-lang/rust/pull/38134 [38146]: https://github.com/rust-lang/rust/pull/38146 [38181]: https://github.com/rust-lang/rust/pull/38181 [38182]: https://github.com/rust-lang/rust/pull/38182 [38185]: https://github.com/rust-lang/rust/pull/38185 [38192]: https://github.com/rust-lang/rust/pull/38192 [38279]: https://github.com/rust-lang/rust/pull/38279 [38835]: https://github.com/rust-lang/rust/pull/38835 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner Version 1.14.0 (2016-12-22) =========================== Language -------- * [`..` matches multiple tuple fields in enum variants, structs and tuples][36843]. [RFC 1492]. * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389] * [`use *` and `use ::*` both glob-import from the crate root][37367] * [It's now possible to call a `Vec>` without explicit dereferencing][36822] Compiler -------- * [Mark enums with non-zero discriminant as non-zero][37224] * [Lower-case `static mut` names are linted like other statics and consts][37162] * [Fix ICE on some macros in const integer positions (e.g. `[u8; m!()]`)][36819] * [Improve error message and snippet for "did you mean `x`"][36798] * [Add a panic-strategy field to the target specification][36794] * [Include LLVM version in `--version --verbose`][37200] Compile-time Optimizations -------------------------- * [Improve macro expansion performance][37569] * [Shrink `Expr_::ExprInlineAsm`][37445] * [Replace all uses of SHA-256 with BLAKE2b][37439] * [Reduce the number of bytes hashed by `IchHasher`][37427] * [Avoid more allocations when compiling html5ever][37373] * [Use `SmallVector` in `CombineFields::instantiate`][37322] * [Avoid some allocations in the macro parser][37318] * [Use a faster deflate setting][37298] * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations during interning of slices][37270] * [Optimize `write_metadata`][37267] * [Don't process obligation forest cycles when stalled][37231] * [Avoid many `CrateConfig` clones][37161] * [Optimize `Substs::super_fold_with`][37108] * [Optimize `ObligationForest`'s `NodeState` handling][36993] * [Speed up `plug_leaks`][36917] Libraries --------- * [`println!()`, with no arguments, prints newline][36825]. Previously, an empty string was required to achieve the same. * [`Wrapping` impls standard binary and unary operators, as well as the `Sum` and `Product` iterators][37356] * [Implement `From> for String` and `From> for Vec`][37326] * [Improve `fold` performance for `chain`, `cloned`, `map`, and `VecDeque` iterators][37315] * [Improve `SipHasher` performance on small values][37312] * [Add Iterator trait TrustedLen to enable better FromIterator / Extend][37306] * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230] * [`ReadDir` implements `Debug`][37221] * [Implement `RefUnwindSafe` for atomic types][37178] * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094] * [Avoid allocations in `Decoder::read_str`][37064] * [`io::Error` implements `From`][37037] * [Impl `Debug` for raw pointers to unsized data][36880] * [Don't reuse `HashMap` random seeds][37470] * [The internal memory layout of `HashMap` is more cache-friendly, for significant improvements in some operations][36692] * [`HashMap` uses less memory on 32-bit architectures][36595] * [Impl `Add<{str, Cow}>` for `Cow`][36430] Cargo ----- * [Expose rustc cfg values to build scripts][cargo/3243] * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259] * [Fix passing --features when testing multiple packages][cargo/3280] * [Use a single profile set per workspace][cargo/3249] * [Load `replace` sections from lock files][cargo/3220] * [Ignore `panic` configuration for test/bench profiles][cargo/3175] Tooling ------- * [rustup is the recommended Rust installation method][1.14rustup] * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and S390x. These are [tier 2] platforms and may have major defects. Follow the instructions on the website to install, or add the targets to an existing installation with `rustup target add`. The new target triples are: - `mips-unknown-linux-gnu` - `mipsel-unknown-linux-gnu` - `mips64-unknown-linux-gnuabi64` - `mips64el-unknown-linux-gnuabi64 ` - `powerpc-unknown-linux-gnu` - `powerpc64-unknown-linux-gnu` - `powerpc64le-unknown-linux-gnu` - `s390x-unknown-linux-gnu ` * This release includes target (std) builds for ARM Linux running MUSL libc. These are [tier 2] platforms and may have major defects. Add the following triples to an existing rustup installation with `rustup target add`: - `arm-unknown-linux-musleabi` - `arm-unknown-linux-musleabihf` - `armv7-unknown-linux-musleabihf` * This release includes [experimental support for WebAssembly][1.14wasm], via the `wasm32-unknown-emscripten` target. This target is known to have major defects. Please test, report, and fix. * rustup no longer installs documentation by default. Run `rustup component add rust-docs` to install. * [Fix line stepping in debugger][37310] * [Enable line number debuginfo in releases][37280] Misc ---- * [Disable jemalloc on aarch64/powerpc/mips][37392] * [Add support for Fuchsia OS][37313] * [Detect local-rebuild by only MAJOR.MINOR version][37273] Compatibility Notes ------------------- * [A number of forward-compatibility lints used by the compiler to gradually introduce language changes have been converted to deny by default][36894]: - ["use of inaccessible extern crate erroneously allowed"][36886] - ["type parameter default erroneously allowed in invalid location"][36887] - ["detects super or self keywords at the beginning of global path"][36888] - ["two overlapping inherent impls define an item with the same name were erroneously allowed"][36889] - ["floating-point constants cannot be used in patterns"][36890] - ["constants of struct or enum type can only be used in a pattern if the struct or enum has `#[derive(PartialEq, Eq)]`"][36891] - ["lifetimes or labels named `'_` were erroneously allowed"][36892] * [Prohibit patterns in trait methods without bodies][37378] * [The atomic `Ordering` enum may not be matched exhaustively][37351] * [Future-proofing `#[no_link]` breaks some obscure cases][37247] * [The `$crate` macro variable is accepted in fewer locations][37213] * [Impls specifying extra region requirements beyond the trait they implement are rejected][37167] * [Enums may not be unsized][37111]. Unsized enums are intended to work but never have. For now they are forbidden. * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767] [tier 2]: https://forge.rust-lang.org/platform-support.html [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627 [36430]: https://github.com/rust-lang/rust/pull/36430 [36595]: https://github.com/rust-lang/rust/pull/36595 [36692]: https://github.com/rust-lang/rust/pull/36692 [36767]: https://github.com/rust-lang/rust/pull/36767 [36794]: https://github.com/rust-lang/rust/pull/36794 [36798]: https://github.com/rust-lang/rust/pull/36798 [36819]: https://github.com/rust-lang/rust/pull/36819 [36822]: https://github.com/rust-lang/rust/pull/36822 [36825]: https://github.com/rust-lang/rust/pull/36825 [36843]: https://github.com/rust-lang/rust/pull/36843 [36880]: https://github.com/rust-lang/rust/pull/36880 [36886]: https://github.com/rust-lang/rust/issues/36886 [36887]: https://github.com/rust-lang/rust/issues/36887 [36888]: https://github.com/rust-lang/rust/issues/36888 [36889]: https://github.com/rust-lang/rust/issues/36889 [36890]: https://github.com/rust-lang/rust/issues/36890 [36891]: https://github.com/rust-lang/rust/issues/36891 [36892]: https://github.com/rust-lang/rust/issues/36892 [36894]: https://github.com/rust-lang/rust/pull/36894 [36917]: https://github.com/rust-lang/rust/pull/36917 [36993]: https://github.com/rust-lang/rust/pull/36993 [37037]: https://github.com/rust-lang/rust/pull/37037 [37064]: https://github.com/rust-lang/rust/pull/37064 [37094]: https://github.com/rust-lang/rust/pull/37094 [37108]: https://github.com/rust-lang/rust/pull/37108 [37111]: https://github.com/rust-lang/rust/pull/37111 [37161]: https://github.com/rust-lang/rust/pull/37161 [37162]: https://github.com/rust-lang/rust/pull/37162 [37167]: https://github.com/rust-lang/rust/pull/37167 [37178]: https://github.com/rust-lang/rust/pull/37178 [37200]: https://github.com/rust-lang/rust/pull/37200 [37213]: https://github.com/rust-lang/rust/pull/37213 [37221]: https://github.com/rust-lang/rust/pull/37221 [37224]: https://github.com/rust-lang/rust/pull/37224 [37230]: https://github.com/rust-lang/rust/pull/37230 [37231]: https://github.com/rust-lang/rust/pull/37231 [37247]: https://github.com/rust-lang/rust/pull/37247 [37267]: https://github.com/rust-lang/rust/pull/37267 [37270]: https://github.com/rust-lang/rust/pull/37270 [37273]: https://github.com/rust-lang/rust/pull/37273 [37280]: https://github.com/rust-lang/rust/pull/37280 [37298]: https://github.com/rust-lang/rust/pull/37298 [37306]: https://github.com/rust-lang/rust/pull/37306 [37310]: https://github.com/rust-lang/rust/pull/37310 [37312]: https://github.com/rust-lang/rust/pull/37312 [37313]: https://github.com/rust-lang/rust/pull/37313 [37315]: https://github.com/rust-lang/rust/pull/37315 [37318]: https://github.com/rust-lang/rust/pull/37318 [37322]: https://github.com/rust-lang/rust/pull/37322 [37326]: https://github.com/rust-lang/rust/pull/37326 [37351]: https://github.com/rust-lang/rust/pull/37351 [37356]: https://github.com/rust-lang/rust/pull/37356 [37367]: https://github.com/rust-lang/rust/pull/37367 [37373]: https://github.com/rust-lang/rust/pull/37373 [37378]: https://github.com/rust-lang/rust/pull/37378 [37389]: https://github.com/rust-lang/rust/pull/37389 [37392]: https://github.com/rust-lang/rust/pull/37392 [37427]: https://github.com/rust-lang/rust/pull/37427 [37439]: https://github.com/rust-lang/rust/pull/37439 [37445]: https://github.com/rust-lang/rust/pull/37445 [37470]: https://github.com/rust-lang/rust/pull/37470 [37569]: https://github.com/rust-lang/rust/pull/37569 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280 Version 1.13.0 (2016-11-10) =========================== Language -------- * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate errors, like the `try!` macro, described in [RFC 0243]. * [Stabilize macros in type position][36014]. Described in [RFC 873]. * [Stabilize attributes on statements][36995]. Described in [RFC 0016]. * [Fix `#[derive]` for empty tuple structs/variants][35728] * [Fix lifetime rules for 'if' conditions][36029] * [Avoid loading and parsing unconfigured non-inline modules][36482] Compiler -------- * [Add the `-C link-arg` argument][36574] * [Remove the old AST-based backend from rustc_trans][35764] * [Don't enable NEON by default on armv7 Linux][35814] * [Fix debug line number info for macro expansions][35238] * [Do not emit "class method" debuginfo for types that are not DICompositeType][36008] * [Warn about multiple conflicting #[repr] hints][34623] * [When sizing DST, don't double-count nested struct prefixes][36351] * [Default RUST_MIN_STACK to 16MiB for now][36505] * [Improve rlib metadata format][36551]. Reduces rlib size significantly. * [Reject macros with empty repetitions to avoid infinite loop][36721] * [Expand macros without recursing to avoid stack overflows][36214] Diagnostics ----------- * [Replace macro backtraces with labeled local uses][35702] * [Improve error message for misplaced doc comments][33922] * [Buffer unix and lock windows to prevent message interleaving][35975] * [Update lifetime errors to specifically note temporaries][36171] * [Special case a few colors for Windows][36178] * [Suggest `use self` when such an import resolves][36289] * [Be more specific when type parameter shadows primitive type][36338] * Many minor improvements Compile-time Optimizations -------------------------- * [Compute and cache HIR hashes at beginning][35854] * [Don't hash types in loan paths][36004] * [Cache projections in trans][35761] * [Optimize the parser's last token handling][36527] * [Only instantiate #[inline] functions in codegen units referencing them][36524]. This leads to big improvements in cases where crates export define many inline functions without using them directly. * [Lazily allocate TypedArena's first chunk][36592] * [Don't allocate during default HashSet creation][36734] Stabilized APIs --------------- * [`checked_abs`] * [`wrapping_abs`] * [`overflowing_abs`] * [`RefCell::try_borrow`] * [`RefCell::try_borrow_mut`] Libraries --------- * [Add `assert_ne!` and `debug_assert_ne!`][35074] * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain` covariant][35354] * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559] * [Implement `Debug` for `std::vec::IntoIter`][35707] * [`CString`: avoid excessive growth just to 0-terminate][35871] * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627] * [Use arc4rand on FreeBSD][35884] * [memrchr: Correct aligned offset computation][35969] * [Improve Demangling of Rust Symbols][36059] * [Use monotonic time in condition variables][35048] * [Implement `Debug` for `std::path::{Components,Iter}`][36101] * [Implement conversion traits for `char`][35755] * [Fix illegal instruction caused by overflow in channel cloning][36104] * [Zero first byte of CString on drop][36264] * [Inherit overflow checks for sum and product][36372] * [Add missing Eq implementations][36423] * [Implement `Debug` for `DirEntry`][36631] * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from `errno`][36754] * [`SipHasher`] is deprecated. Use [`DefaultHasher`]. * [Implement more traits for `std::io::ErrorKind`][35911] * [Optimize BinaryHeap bounds checking][36072] * [Work around pointer aliasing issue in `Vec::extend_from_slice`, `extend_with_element`][36355] * [Fix overflow checking in unsigned pow()][34942] Cargo ----- * This release includes security fixes to both curl and OpenSSL. * [Fix transitive doctests when panic=abort][cargo/3021] * [Add --all-features flag to cargo][cargo/3038] * [Reject path-based dependencies in `cargo package`][cargo/3060] * [Don't parse the home directory more than once][cargo/3078] * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092] * [Update OpenSSL to 1.0.2j][cargo/3121] * [Add license and license_file to cargo metadata output][cargo/3110] * [Make crates-io registry URL optional in config; ignore all changes to source.crates-io][cargo/3089] * [Don't download dependencies from other platforms][cargo/3123] * [Build transitive dev-dependencies when needed][cargo/3125] * [Add support for per-target rustflags in .cargo/config][cargo/3157] * [Avoid updating registry when adding existing deps][cargo/3144] * [Warn about path overrides that won't work][cargo/3136] * [Use workspaces during `cargo install`][cargo/3146] * [Leak mspdbsrv.exe processes on Windows][cargo/3162] * [Add --message-format flag][cargo/3000] * [Pass target environment for rustdoc][cargo/3205] * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818] * [Update curl and curl-sys][cargo/3241] * [Call rustdoc test with the correct cfg flags of a package][cargo/3242] Tooling ------- * [rustdoc: Add the `--sysroot` argument][36586] * [rustdoc: Fix a couple of issues with the search results][35655] * [rustdoc: remove the `!` from macro URLs and titles][35234] * [gdb: Fix pretty-printing special-cased Rust types][35585] * [rustdoc: Filter more incorrect methods inherited through Deref][36266] Misc ---- * [Remove unmaintained style guide][35124] * [Add s390x support][36369] * [Initial work at Haiku OS support][36727] * [Add mips-uclibc targets][35734] * [Crate-ify compiler-rt into compiler-builtins][35021] * [Add rustc version info (git hash + date) to dist tarball][36213] * Many documentation improvements Compatibility Notes ------------------- * [`SipHasher`] is deprecated. Use [`DefaultHasher`]. * [Deny (by default) transmuting from fn item types to pointer-sized types][34923]. Continuing the long transition to zero-sized fn items, per [RFC 401]. * [Fix `#[derive]` for empty tuple structs/variants][35728]. Part of [RFC 1506]. * [Issue deprecation warnings for safe accesses to extern statics][36173] * [Fix lifetime rules for 'if' conditions][36029]. * [Inherit overflow checks for sum and product][36372]. * [Forbid user-defined macros named "macro_rules"][36730]. [33922]: https://github.com/rust-lang/rust/pull/33922 [34623]: https://github.com/rust-lang/rust/pull/34623 [34923]: https://github.com/rust-lang/rust/pull/34923 [34942]: https://github.com/rust-lang/rust/pull/34942 [35021]: https://github.com/rust-lang/rust/pull/35021 [35048]: https://github.com/rust-lang/rust/pull/35048 [35074]: https://github.com/rust-lang/rust/pull/35074 [35124]: https://github.com/rust-lang/rust/pull/35124 [35234]: https://github.com/rust-lang/rust/pull/35234 [35238]: https://github.com/rust-lang/rust/pull/35238 [35354]: https://github.com/rust-lang/rust/pull/35354 [35559]: https://github.com/rust-lang/rust/pull/35559 [35585]: https://github.com/rust-lang/rust/pull/35585 [35627]: https://github.com/rust-lang/rust/pull/35627 [35655]: https://github.com/rust-lang/rust/pull/35655 [35702]: https://github.com/rust-lang/rust/pull/35702 [35707]: https://github.com/rust-lang/rust/pull/35707 [35728]: https://github.com/rust-lang/rust/pull/35728 [35734]: https://github.com/rust-lang/rust/pull/35734 [35755]: https://github.com/rust-lang/rust/pull/35755 [35761]: https://github.com/rust-lang/rust/pull/35761 [35764]: https://github.com/rust-lang/rust/pull/35764 [35814]: https://github.com/rust-lang/rust/pull/35814 [35854]: https://github.com/rust-lang/rust/pull/35854 [35871]: https://github.com/rust-lang/rust/pull/35871 [35884]: https://github.com/rust-lang/rust/pull/35884 [35911]: https://github.com/rust-lang/rust/pull/35911 [35969]: https://github.com/rust-lang/rust/pull/35969 [35975]: https://github.com/rust-lang/rust/pull/35975 [36004]: https://github.com/rust-lang/rust/pull/36004 [36008]: https://github.com/rust-lang/rust/pull/36008 [36014]: https://github.com/rust-lang/rust/pull/36014 [36029]: https://github.com/rust-lang/rust/pull/36029 [36059]: https://github.com/rust-lang/rust/pull/36059 [36072]: https://github.com/rust-lang/rust/pull/36072 [36101]: https://github.com/rust-lang/rust/pull/36101 [36104]: https://github.com/rust-lang/rust/pull/36104 [36171]: https://github.com/rust-lang/rust/pull/36171 [36173]: https://github.com/rust-lang/rust/pull/36173 [36178]: https://github.com/rust-lang/rust/pull/36178 [36213]: https://github.com/rust-lang/rust/pull/36213 [36214]: https://github.com/rust-lang/rust/pull/36214 [36264]: https://github.com/rust-lang/rust/pull/36264 [36266]: https://github.com/rust-lang/rust/pull/36266 [36289]: https://github.com/rust-lang/rust/pull/36289 [36338]: https://github.com/rust-lang/rust/pull/36338 [36351]: https://github.com/rust-lang/rust/pull/36351 [36355]: https://github.com/rust-lang/rust/pull/36355 [36369]: https://github.com/rust-lang/rust/pull/36369 [36372]: https://github.com/rust-lang/rust/pull/36372 [36423]: https://github.com/rust-lang/rust/pull/36423 [36482]: https://github.com/rust-lang/rust/pull/36482 [36505]: https://github.com/rust-lang/rust/pull/36505 [36524]: https://github.com/rust-lang/rust/pull/36524 [36527]: https://github.com/rust-lang/rust/pull/36527 [36551]: https://github.com/rust-lang/rust/pull/36551 [36574]: https://github.com/rust-lang/rust/pull/36574 [36586]: https://github.com/rust-lang/rust/pull/36586 [36592]: https://github.com/rust-lang/rust/pull/36592 [36631]: https://github.com/rust-lang/rust/pull/36631 [36721]: https://github.com/rust-lang/rust/pull/36721 [36727]: https://github.com/rust-lang/rust/pull/36727 [36730]: https://github.com/rust-lang/rust/pull/36730 [36734]: https://github.com/rust-lang/rust/pull/36734 [36754]: https://github.com/rust-lang/rust/pull/36754 [36995]: https://github.com/rust-lang/rust/pull/36995 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html Version 1.12.1 (2016-10-20) =========================== Regression Fixes ---------------- * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381] * [Confusion with double negation and booleans][36856] * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875] * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924] * [1.12.0: High memory usage when linking in release mode with debug info][36926] * [Corrupted memory after updated to 1.12][36936] * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026] * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112] * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153] [36381]: https://github.com/rust-lang/rust/issues/36381 [36856]: https://github.com/rust-lang/rust/issues/36856 [36875]: https://github.com/rust-lang/rust/issues/36875 [36924]: https://github.com/rust-lang/rust/issues/36924 [36926]: https://github.com/rust-lang/rust/issues/36926 [36936]: https://github.com/rust-lang/rust/issues/36936 [37026]: https://github.com/rust-lang/rust/issues/37026 [37112]: https://github.com/rust-lang/rust/issues/37112 [37153]: https://github.com/rust-lang/rust/issues/37153 Version 1.12.0 (2016-09-29) =========================== Highlights ---------- * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096). This translation pass is far simpler than the previous AST->LLVM pass, and creates opportunities to perform new optimizations directly on the MIR. It was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html). * [`rustc` presents a new, more readable error format, along with machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401). Most common editors supporting Rust have been updated to work with it. It was previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html). Compiler -------- * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096). This translation pass is far simpler than the previous AST->LLVM pass, and creates opportunities to perform new optimizations directly on the MIR. It was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html). * [Print the Rust target name, not the LLVM target name, with `--print target-list`](https://github.com/rust-lang/rust/pull/35489) * [The computation of `TypeId` is correct in some cases where it was previously producing inconsistent results](https://github.com/rust-lang/rust/pull/35267) * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910) * [The `rustc` arguments, `--print target-cpus`, `--print target-features`, `--print relocation-models`, and `--print code-models` print the available options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845) * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`, `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060). These targets produce statically-linked binaries. There are no binary release builds yet though. Diagnostics ----------- * [`rustc` presents a new, more readable error format, along with machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401). Most common editors supporting Rust have been updated to work with it. It was previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html). * [In error descriptions, references are now described in plain English, instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611) * [In error type descriptions, unknown numeric types are named `{integer}` or `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080) * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676) Language -------- * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925) * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453) * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more useful](https://github.com/rust-lang/rust/pull/34908) * [`macro_rules!` `stmt` matchers correctly consume the entire contents when inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886) * [Semicolons are properly required as statement delimiters inside `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660) * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546) Stabilized APIs --------------- * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr) * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr) * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified) * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback) * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast) * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified) * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets) * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains) * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains) * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw). Both on Unix and Windows. * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout) * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html) * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut) * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html) * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html) * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html) * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry) * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key) Libraries --------- * [The `format!` macro and friends now allow a single argument to be formatted in multiple styles](https://github.com/rust-lang/rust/pull/33642) * [The lifetime bounds on `[T]::binary_search_by` and `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762) * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828) * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392) * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378) * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354) * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951) * [`Cow` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064) * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946) * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry` implement `Debug`](https://github.com/rust-lang/rust/pull/34937) * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry` implement `Debug`](https://github.com/rust-lang/rust/pull/34885) * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890) * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879) * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757) * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756) * [`mpsc::sync_channel` `Receiver`s return any available message before reporting a disconnect](https://github.com/rust-lang/rust/pull/34731) * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599) * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312) Cargo ----- * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857) * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679) * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007) * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988) * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974) * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971) * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954) * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946) * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938) * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921) * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917) * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909) * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876) * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867) * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849) * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794) Performance ----------- * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444) * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866) Tooling ------- * [Test binaries now support a `--test-threads` argument to specify the number of threads used to run tests, and which acts the same as the `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414) * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405) * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752) * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646) * [Rust releases now come with source packages that can be installed by rustup via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366). The resulting source code can be used by tools and IDES, located in the sysroot under `lib/rustlib/src`. Misc ---- * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594) * Many minor improvements to the documentation. * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832) Compatibility Notes ------------------- * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084) * [When formatting strings, if "precision" is specified, the "fill", "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544) * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485) Version 1.11.0 (2016-08-18) =========================== Language -------- * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216) * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436) * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213) * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032) Stabilized APIs --------------- * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append) * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append) * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off) * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append) * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off) * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees) (in libcore - previously stabilized in libstd) * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians) (in libcore - previously stabilized in libstd) * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees) (in libcore - previously stabilized in libstd) * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians) (in libcore - previously stabilized in libstd) * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum) * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.product) * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut) * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut) Libraries --------- * [The `thread_local!` macro supports multiple definitions in a single invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077) * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305) * [`Wrapping` implements binary, octal, lower-hex and upper-hex `Display` formatting](https://github.com/rust-lang/rust/pull/34190) * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180) * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067) * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976) * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803) Cargo ----- * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821) * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804) * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795) * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787) * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630), and `-vv` prints warnings for all crates. * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720) * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668). This provides room for expansion by arbitrary tools. * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741) * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781) * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704) * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779) * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780) * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772) * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739) Performance ----------- * [Caching projections speeds up type check dramatically for some workloads](https://github.com/rust-lang/rust/pull/33816) * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940) This hasher is faster, but is believed to provide sufficient protection from collision attacks. * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891) Rustdoc ------- * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536) * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479) * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477) * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387) * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245) Tooling ------- * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492) * [When emitting debug info, rustc emits frame pointers for closures, shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909) * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646) * Many more errors have been given error codes and extended explanations * API documentation continues to be improved, with many new examples Misc ---- * [rustc no longer hangs when dependencies recursively re-export submodules](https://github.com/rust-lang/rust/pull/34542) * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104) * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was rewritten](https://github.com/rust-lang/rust/pull/33895) * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460). No targets use this yet, but it works toward AVR support. Compatibility Notes ------------------- * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443) * [The new follow-set rules that place restrictions on `macro_rules!` in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982) This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384), and has been a warning since 1.10. * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706). This causes breakage in some corner cases. Version 1.10.0 (2016-07-07) =========================== Language -------- * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420). [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md). * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355). * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908). * [`panic!` can be converted to a runtime abort with the `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900). [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md). * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553). cdylibs are dynamic libraries suitable for loading by non-Rust hosts. [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md). Note that Cargo does not yet directly support cdylibs. Stabilized APIs --------------- * `os::windows::fs::OpenOptionsExt::access_mode` * `os::windows::fs::OpenOptionsExt::share_mode` * `os::windows::fs::OpenOptionsExt::custom_flags` * `os::windows::fs::OpenOptionsExt::attributes` * `os::windows::fs::OpenOptionsExt::security_qos_flags` * `os::unix::fs::OpenOptionsExt::custom_flags` * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new) * `Default for sync::Weak` * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html) * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html) * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html) * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload) * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location) * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html) * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file) * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line) * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul) * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked) * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html) * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified) * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed) * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created) * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange` * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak` * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key` * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}` * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed) * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname) * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect) * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair) * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone) * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr) * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr) * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout) * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout) * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout) * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout) * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking) * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error) * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown) * Read/Write/RawFd impls for `UnixStream` * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind) * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept) * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone) * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr) * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking) * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error) * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming) * RawFd impls for `UnixListener` * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind) * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound) * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair) * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect) * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone) * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr) * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr) * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from) * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv) * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to) * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send) * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout) * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout) * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout) * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout) * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking) * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error) * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown) * RawFd impls for `UnixDatagram` * `{BTree,Hash}Map::values_mut` * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key) Libraries --------- * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664). The semantics of this minor method are subtle and probably not what most people want. * [Add implementation of Ord for Cell and RefCell where T: Ord](https://github.com/rust-lang/rust/pull/33306). * [On Linux, if `HashMap`s can't be initialized with `getrandom` they will fall back to `/dev/urandom` temporarily to avoid blocking during early boot](https://github.com/rust-lang/rust/pull/33086). * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067). * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050). * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023). * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990). * [Implement `From>` and `Into>` for `VecDeque`](https://github.com/rust-lang/rust/pull/32866). * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`, `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785). Cargo ----- * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687). This controls the runtime behavior of the `panic!` macro and can be either "unwind" (the default), or "abort". [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md). * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723). * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693). * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710). * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707). * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604). * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396). By default they are retried twice, which can be customized with the `net.retry` value in `.cargo/config`. * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674). * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405). * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623). * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610). Makes it possible to install multiple crates in parallel. * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578). * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551). * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576). * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577). * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560). * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584). Performance ----------- * [rustc memory usage was reduced by refactoring the context used for type checking](https://github.com/rust-lang/rust/pull/33425). * [Speed up creation of `HashMap`s by caching the random keys used to initialize the hash state](https://github.com/rust-lang/rust/pull/33318). * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289). * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138). * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098). 10x faster than the previous lookup tables. * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414). Usability --------- * Many incremental improvements to documentation and rustdoc. * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514). * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151). * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401). * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406). * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338). * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325). * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319). Misc ---- * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651). * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500). * [`std` no longer prints backtraces on platforms where the running module must be loaded with `env::current_exe`, which can't be relied on](https://github.com/rust-lang/rust/pull/33554). * This release includes std binaries for the i586-unknown-linux-gnu, i686-unknown-linux-musl, and armv7-linux-androideabi targets. The i586 target is for old x86 hardware without SSE2, and the armv7 target is for Android running on modern ARM architectures. * [The `rust-gdb` and `rust-lldb` scripts are distributed on all Unix platforms](https://github.com/rust-lang/rust/pull/32835). * [On Unix the runtime aborts by calling `libc::abort` instead of generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457). * [Rust is now bootstrapped from the previous release of Rust, instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942). Compatibility Notes ------------------- * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579). * [`target_env` for Linux ARM targets is just `gnu`, not `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403). * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072). * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977). * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945). Affects how macros are parsed. * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923). * [Feature-gated attributes on macro-generated macro invocations are now rejected](https://github.com/rust-lang/rust/pull/32791). * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258). This caused some minor changes to type inference. Version 1.9.0 (2016-05-26) ========================== Language -------- * The `#[deprecated]` attribute when applied to an API will generate warnings when used. The warnings may be suppressed with `#[allow(deprecated)]`. [RFC 1270]. * [`fn` item types are zero sized, and each `fn` names a unique type][1.9fn]. This will break code that transmutes `fn`s, so calling `transmute` on a `fn` type will generate a warning for a few cycles, then will be converted to an error. * [Field and method resolution understand visibility, so private fields and methods cannot prevent the proper use of public fields and methods][1.9fv]. * [The parser considers unicode codepoints in the `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws]. Stabilized APIs --------------- * [`std::panic`] * [`std::panic::catch_unwind`] (renamed from `recover`) * [`std::panic::resume_unwind`] (renamed from `propagate`) * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`) * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`) * [`str::is_char_boundary`] * [`<*const T>::as_ref`] * [`<*mut T>::as_ref`] * [`<*mut T>::as_mut`] * [`AsciiExt::make_ascii_uppercase`] * [`AsciiExt::make_ascii_lowercase`] * [`char::decode_utf16`] * [`char::DecodeUtf16`] * [`char::DecodeUtf16Error`] * [`char::DecodeUtf16Error::unpaired_surrogate`] * [`BTreeSet::take`] * [`BTreeSet::replace`] * [`BTreeSet::get`] * [`HashSet::take`] * [`HashSet::replace`] * [`HashSet::get`] * [`OsString::with_capacity`] * [`OsString::clear`] * [`OsString::capacity`] * [`OsString::reserve`] * [`OsString::reserve_exact`] * [`OsStr::is_empty`] * [`OsStr::len`] * [`std::os::unix::thread`] * [`RawPthread`] * [`JoinHandleExt`] * [`JoinHandleExt::as_pthread_t`] * [`JoinHandleExt::into_pthread_t`] * [`HashSet::hasher`] * [`HashMap::hasher`] * [`CommandExt::exec`] * [`File::try_clone`] * [`SocketAddr::set_ip`] * [`SocketAddr::set_port`] * [`SocketAddrV4::set_ip`] * [`SocketAddrV4::set_port`] * [`SocketAddrV6::set_ip`] * [`SocketAddrV6::set_port`] * [`SocketAddrV6::set_flowinfo`] * [`SocketAddrV6::set_scope_id`] * [`slice::copy_from_slice`] * [`ptr::read_volatile`] * [`ptr::write_volatile`] * [`OpenOptions::create_new`] * [`TcpStream::set_nodelay`] * [`TcpStream::nodelay`] * [`TcpStream::set_ttl`] * [`TcpStream::ttl`] * [`TcpStream::set_only_v6`] * [`TcpStream::only_v6`] * [`TcpStream::take_error`] * [`TcpStream::set_nonblocking`] * [`TcpListener::set_ttl`] * [`TcpListener::ttl`] * [`TcpListener::set_only_v6`] * [`TcpListener::only_v6`] * [`TcpListener::take_error`] * [`TcpListener::set_nonblocking`] * [`UdpSocket::set_broadcast`] * [`UdpSocket::broadcast`] * [`UdpSocket::set_multicast_loop_v4`] * [`UdpSocket::multicast_loop_v4`] * [`UdpSocket::set_multicast_ttl_v4`] * [`UdpSocket::multicast_ttl_v4`] * [`UdpSocket::set_multicast_loop_v6`] * [`UdpSocket::multicast_loop_v6`] * [`UdpSocket::set_multicast_ttl_v6`] * [`UdpSocket::multicast_ttl_v6`] * [`UdpSocket::set_ttl`] * [`UdpSocket::ttl`] * [`UdpSocket::set_only_v6`] * [`UdpSocket::only_v6`] * [`UdpSocket::join_multicast_v4`] * [`UdpSocket::join_multicast_v6`] * [`UdpSocket::leave_multicast_v4`] * [`UdpSocket::leave_multicast_v6`] * [`UdpSocket::take_error`] * [`UdpSocket::connect`] * [`UdpSocket::send`] * [`UdpSocket::recv`] * [`UdpSocket::set_nonblocking`] Libraries --------- * [`std::sync::Once` is poisoned if its initialization function fails][1.9o]. * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu]. * [Most types implement `fmt::Debug`][1.9db]. * [The default buffer size used by `BufReader` and `BufWriter` was reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size used by other languages. * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`. `Duration` additionally implements `*=` and `/=`][1.9ta]. * [`Skip` is a `DoubleEndedIterator`][1.9sk]. * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi]. * [`Chain` implements `BufRead`][1.9ch]. * [`HashMap`, `HashSet` and iterators are covariant][1.9hc]. Cargo ----- * [Cargo can now run concurrently][1.9cc]. * [Top-level overrides allow specific revisions of crates to be overridden through the entire crate graph][1.9ct]. This is intended to make upgrades easier for large projects, by allowing crates to be forked temporarily until they've been upgraded and republished. * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp]. * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc` on the commandline][1.9cf]. `rustc` arguments can also be specified in the `build.rustflags` configuration key. Performance ----------- * [The time complexity of comparing variables for equivalence during type unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads to major compilation time improvement in some scenarios. * [`ToString` is specialized for `str`, giving it the same performance as `to_owned`][1.9ts]. * [Spawning processes with `Command::output` no longer creates extra threads][1.9sp]. * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code for C-like enums][1.9cl]. Misc ---- * [Passing the `--quiet` flag to a test runner will produce much-abbreviated output][1.9q]. * The Rust Project now publishes std binaries for the `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and `i586-pc-windows-msvc` targets. Compatibility Notes ------------------- * [`std::sync::Once` is poisoned if its initialization function fails][1.9o]. * [It is illegal to define methods with the same name in overlapping inherent `impl` blocks][1.9sn]. * [`fn` item types are zero sized, and each `fn` names a unique type][1.9fn]. This will break code that transmutes `fn`s, so calling `transmute` on a `fn` type will generate a warning for a few cycles, then will be converted to an error. * [Improvements to const evaluation may trigger new errors when integer literals are out of range][1.9ce]. [1.9bf]: https://github.com/rust-lang/rust/pull/32695 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486 [1.9ce]: https://github.com/rust-lang/rust/pull/30587 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241 [1.9ch]: https://github.com/rust-lang/rust/pull/32541 [1.9cl]: https://github.com/rust-lang/rust/pull/31977 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385 [1.9cu]: https://github.com/rust-lang/rust/pull/32652 [1.9db]: https://github.com/rust-lang/rust/pull/32054 [1.9fi]: https://github.com/rust-lang/rust/pull/32050 [1.9fn]: https://github.com/rust-lang/rust/pull/31710 [1.9fv]: https://github.com/rust-lang/rust/pull/31938 [1.9hc]: https://github.com/rust-lang/rust/pull/32635 [1.9o]: https://github.com/rust-lang/rust/pull/32325 [1.9q]: https://github.com/rust-lang/rust/pull/31887 [1.9sk]: https://github.com/rust-lang/rust/pull/31700 [1.9sn]: https://github.com/rust-lang/rust/pull/31925 [1.9sp]: https://github.com/rust-lang/rust/pull/31618 [1.9ta]: https://github.com/rust-lang/rust/pull/32448 [1.9ts]: https://github.com/rust-lang/rust/pull/32586 [1.9tu]: https://github.com/rust-lang/rust/pull/32062 [1.9ws]: https://github.com/rust-lang/rust/pull/29734 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary Version 1.8.0 (2016-04-14) ========================== Language -------- * Rust supports overloading of compound assignment statements like `+=` by implementing the [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`] traits. [RFC 953]. * Empty structs can be defined with braces, as in `struct Foo { }`, in addition to the non-braced form, `struct Foo;`. [RFC 218]. Libraries --------- * Stabilized APIs: * [`str::encode_utf16`] (renamed from `utf16_units`) * [`str::EncodeUtf16`] (renamed from `Utf16Units`) * [`Ref::map`] * [`RefMut::map`] * [`ptr::drop_in_place`] * [`time::Instant`] * [`time::SystemTime`] * [`Instant::now`] * [`Instant::duration_since`] (renamed from `duration_from_earlier`) * [`Instant::elapsed`] * [`SystemTime::now`] * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`) * [`SystemTime::elapsed`] * Various `Add`/`Sub` impls for `Time` and `SystemTime` * [`SystemTimeError`] * [`SystemTimeError::duration`] * Various impls for `SystemTimeError` * [`UNIX_EPOCH`] * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`]. * [The `write!` and `writeln!` macros correctly emit errors if any of their arguments can't be formatted][1.8w]. * [Various I/O functions support large files on 32-bit Linux][1.8l]. * [The Unix-specific `raw` modules, which contain a number of redefined C types are deprecated][1.8r], including `os::raw::unix`, `os::raw::macos`, and `os::raw::linux`. These modules defined types such as `ino_t` and `dev_t`. The inconsistency of these definitions across platforms was making it difficult to implement `std` correctly. Those that need these definitions should use the `libc` crate. [RFC 1415]. * The Unix-specific `MetadataExt` traits, including `os::unix::fs::MetadataExt`, which expose values such as inode numbers [no longer return platform-specific types][1.8r], but instead return widened integers. [RFC 1415]. * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv]. * [Atomic loads and stores are not volatile][1.8a]. * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp]. Performance ----------- * [Inlining hash functions lead to a 3% compile-time improvement in some workloads][1.8h]. * When using jemalloc, its symbols are [unprefixed so that it overrides the libc malloc implementation][1.8h]. This means that for rustc, LLVM is now using jemalloc, which results in a 6% compile-time improvement on a specific workload. * [Avoid quadratic growth in function size due to cleanups][1.8cu]. Misc ---- * [32-bit MSVC builds finally implement unwinding][1.8ms]. i686-pc-windows-msvc is now considered a tier-1 platform. * [The `--print targets` flag prints a list of supported targets][1.8t]. * [The `--print cfg` flag prints the `cfg`s defined for the current target][1.8cf]. * [`rustc` can be built with an new Cargo-based build system, written in Rust][1.8b]. It will eventually replace Rust's Makefile-based build system. To enable it configure with `configure --rustbuild`. * [Errors for non-exhaustive `match` patterns now list up to 3 missing variants while also indicating the total number of missing variants if more than 3][1.8m]. * [Executable stacks are disabled on Linux and BSD][1.8nx]. * The Rust Project now publishes binary releases of the standard library for a number of tier-2 targets: `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`, `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu` `x86_64-rumprun-netbsd`. These can be installed with tools such as [multirust][1.8mr]. Cargo ----- * [`cargo init` creates a new Cargo project in the current directory][1.8ci]. It is otherwise like `cargo new`. * [Cargo has configuration keys for `-v` and `--color`][1.8cc]. `verbose` and `color`, respectively, go in the `[term]` section of `.cargo/config`. * [Configuration keys that evaluate to strings or integers can be set via environment variables][1.8ce]. For example the `build.jobs` key can be set via `CARGO_BUILD_JOBS`. Environment variables take precedence over config files. * [Target-specific dependencies support Rust `cfg` syntax for describing targets][1.8cfg] so that dependencies for multiple targets can be specified together. [RFC 1361]. * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and `RUSTDOC` take precedence over the `build.target-dir`, `build.rustc`, and `build.rustdoc` configuration values][1.8cfv]. * [The child process tree is killed on Windows when Cargo is killed][1.8ck]. * [The `build.target` configuration value sets the target platform, like `--target`][1.8ct]. Compatibility Notes ------------------- * [Unstable compiler flags have been further restricted][1.8u]. Since 1.0 `-Z` flags have been considered unstable, and other flags that were considered unstable additionally required passing `-Z unstable-options` to access. Unlike unstable language and library features though, these options have been accessible on the stable release channel. Going forward, *new unstable flags will not be available on the stable release channel*, and old unstable flags will warn about their usage. In the future, all unstable flags will be unavailable on the stable release channel. * [It is no longer possible to `match` on empty enum variants using the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6. * The Unix-specific `MetadataExt` traits, including `os::unix::fs::MetadataExt`, which expose values such as inode numbers [no longer return platform-specific types][1.8r], but instead return widened integers. [RFC 1415]. * [Modules sourced from the filesystem cannot appear within arbitrary blocks, but only within other modules][1.8mf]. * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c]. * On Unix, [stack overflow triggers a runtime abort instead of a SIGSEGV][1.8so]. * [`Command::spawn` and its equivalents return an error if any of its command-line arguments contain interior `NUL`s][1.8n]. * [Tuple and unit enum variants from other crates are in the type namespace][1.8tn]. * [On Windows `rustc` emits `.lib` files for the `staticlib` library type instead of `.a` files][1.8st]. Additionally, for the MSVC toolchain, `rustc` emits import libraries named `foo.dll.lib` instead of `foo.lib`. [1.8a]: https://github.com/rust-lang/rust/pull/30962 [1.8b]: https://github.com/rust-lang/rust/pull/31123 [1.8c]: https://github.com/rust-lang/rust/pull/31530 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398 [1.8cf]: https://github.com/rust-lang/rust/pull/31278 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335 [1.8cu]: https://github.com/rust-lang/rust/pull/31390 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365 [1.8cv]: https://github.com/rust-lang/rust/pull/30998 [1.8h]: https://github.com/rust-lang/rust/pull/31460 [1.8l]: https://github.com/rust-lang/rust/pull/31668 [1.8m]: https://github.com/rust-lang/rust/pull/31020 [1.8mf]: https://github.com/rust-lang/rust/pull/31534 [1.8mp]: https://github.com/rust-lang/rust/pull/30894 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901 [1.8ms]: https://github.com/rust-lang/rust/pull/30448 [1.8n]: https://github.com/rust-lang/rust/pull/31056 [1.8nx]: https://github.com/rust-lang/rust/pull/30859 [1.8r]: https://github.com/rust-lang/rust/pull/31551 [1.8so]: https://github.com/rust-lang/rust/pull/31333 [1.8st]: https://github.com/rust-lang/rust/pull/29520 [1.8t]: https://github.com/rust-lang/rust/pull/31358 [1.8tn]: https://github.com/rust-lang/rust/pull/30882 [1.8u]: https://github.com/rust-lang/rust/pull/31793 [1.8v]: https://github.com/rust-lang/rust/pull/31757 [1.8w]: https://github.com/rust-lang/rust/pull/31904 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html Version 1.7.0 (2016-03-03) ========================== Libraries --------- * Stabilized APIs * `Path` * [`Path::strip_prefix`] (renamed from relative_from) * [`path::StripPrefixError`] (new error type returned from strip_prefix) * `Ipv4Addr` * [`Ipv4Addr::is_loopback`] * [`Ipv4Addr::is_private`] * [`Ipv4Addr::is_link_local`] * [`Ipv4Addr::is_multicast`] * [`Ipv4Addr::is_broadcast`] * [`Ipv4Addr::is_documentation`] * `Ipv6Addr` * [`Ipv6Addr::is_unspecified`] * [`Ipv6Addr::is_loopback`] * [`Ipv6Addr::is_multicast`] * `Vec` * [`Vec::as_slice`] * [`Vec::as_mut_slice`] * `String` * [`String::as_str`] * [`String::as_mut_str`] * Slices * `<[T]>::`[`clone_from_slice`], which now requires the two slices to be the same length * `<[T]>::`[`sort_by_key`] * checked, saturated, and overflowing operations * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`] * [`i32::saturating_mul`] * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`] * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`] * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`] * [`u32::saturating_mul`] * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`] * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`] * and checked, saturated, and overflowing operations for other primitive types * FFI * [`ffi::IntoStringError`] * [`CString::into_string`] * [`CString::into_bytes`] * [`CString::into_bytes_with_nul`] * `From for Vec` * `IntoStringError` * [`IntoStringError::into_cstring`] * [`IntoStringError::utf8_error`] * `Error for IntoStringError` * Hashing * [`std::hash::BuildHasher`] * [`BuildHasher::Hasher`] * [`BuildHasher::build_hasher`] * [`std::hash::BuildHasherDefault`] * [`HashMap::with_hasher`] * [`HashMap::with_capacity_and_hasher`] * [`HashSet::with_hasher`] * [`HashSet::with_capacity_and_hasher`] * [`std::collections::hash_map::RandomState`] * [`RandomState::new`] * [Validating UTF-8 is faster by a factor of between 7 and 14x for ASCII input][1.7utf8]. This means that creating `String`s and `str`s from bytes is faster. * [The performance of `LineWriter` (and thus `io::stdout`) was improved by using `memchr` to search for newlines][1.7m]. * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The `f64` variants were stabilized previously. * [`BTreeMap` was rewritten to use less memory and improve the performance of insertion and iteration, the latter by as much as 5x][1.7bm]. * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are covariant over their contained type][1.7bt]. * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant over their contained type][1.7ll]. * [`str::replace` now accepts a `Pattern`][1.7rp], like other string searching methods. * [`Any` is implemented for unsized types][1.7a]. * [`Hash` is implemented for `Duration`][1.7h]. Misc ---- * [When running tests with `--test`, rustdoc will pass `--cfg` arguments to the compiler][1.7dt]. * [The compiler is built with RPATH information by default][1.7rpa]. This means that it will be possible to run `rustc` when installed in unusual configurations without configuring the dynamic linker search path explicitly. * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes any RPATH entries (emitted with `-C rpath`) *not* take precedence over `LD_LIBRARY_PATH`. Cargo ----- * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp]. * [The `rerun-if-changed` build script directive no longer causes the build script to incorrectly run twice in certain scenarios][1.7rr]. Compatibility Notes ------------------- * Soundness fixes to the interactions between associated types and lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for code that violates the new rules. This is a significant change that is known to break existing code, so it has emitted warnings for the new error cases since 1.4 to give crate authors time to adapt. The details of what is changing are subtle; read the RFC for more. * [Several bugs in the compiler's visibility calculations were fixed][1.7v]. Since this was found to break significant amounts of code, the new errors will be emitted as warnings for several release cycles, under the `private_in_public` lint. * Defaulted type parameters were accidentally accepted in positions that were not intended. In this release, [defaulted type parameters appearing outside of type definitions will generate a warning][1.7d], which will become an error in future releases. * [Parsing "." as a float results in an error instead of 0][1.7p]. That is, `".".parse::()` returns `Err`, not `Ok(0.0)`. * [Borrows of closure parameters may not outlive the closure][1.7bc]. [1.7a]: https://github.com/rust-lang/rust/pull/30928 [1.7bc]: https://github.com/rust-lang/rust/pull/30341 [1.7bm]: https://github.com/rust-lang/rust/pull/30426 [1.7bt]: https://github.com/rust-lang/rust/pull/30998 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224 [1.7d]: https://github.com/rust-lang/rust/pull/30724 [1.7dt]: https://github.com/rust-lang/rust/pull/30372 [1.7dta]: https://github.com/rust-lang/rust/pull/30394 [1.7f]: https://github.com/rust-lang/rust/pull/30672 [1.7h]: https://github.com/rust-lang/rust/pull/30818 [1.7ll]: https://github.com/rust-lang/rust/pull/30663 [1.7m]: https://github.com/rust-lang/rust/pull/30381 [1.7p]: https://github.com/rust-lang/rust/pull/30681 [1.7rp]: https://github.com/rust-lang/rust/pull/29498 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279 [1.7sf]: https://github.com/rust-lang/rust/pull/30389 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740 [1.7v]: https://github.com/rust-lang/rust/pull/29973 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul Version 1.6.0 (2016-01-21) ========================== Language -------- * The `#![no_std]` attribute causes a crate to not be linked to the standard library, but only the [core library][1.6co], as described in [RFC 1184]. The core library defines common types and traits but has no platform dependencies whatsoever, and is the basis for Rust software in environments that cannot support a full port of the standard library, such as operating systems. Most of the core library is now stable. Libraries --------- * Stabilized APIs: [`Read::read_exact`], [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`), [`fs::DirBuilder`], [`fs::DirBuilder::new`], [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`], [`os::unix::fs::DirBuilderExt`], [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`], [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`], [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`], [`collections::hash_map::Drain`], [`collections::hash_map::HashMap::drain`], [`collections::hash_set::Drain`], [`collections::hash_set::HashSet::drain`], [`collections::binary_heap::Drain`], [`collections::binary_heap::BinaryHeap::drain`], [`Vec::extend_from_slice`] (renamed from `push_all`), [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`], [`RwLock::into_inner`], [`Iterator::min_by_key`] (renamed from `min_by`), [`Iterator::max_by_key`] (renamed from `max_by`). * The [core library][1.6co] is stable, as are most of its APIs. * [The `assert_eq!` macro supports arguments that don't implement `Sized`][1.6ae], such as arrays. In this way it behaves more like `assert!`. * Several timer functions that take duration in milliseconds [are deprecated in favor of those that take `Duration`][1.6ms]. These include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and `thread::park_timeout_ms`. * The algorithm by which `Vec` reserves additional elements was [tweaked to not allocate excessive space][1.6a] while still growing exponentially. * `From` conversions are [implemented from integers to floats][1.6f] in cases where the conversion is lossless. Thus they are not implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32` or `f64`. They are also not implemented for `isize` and `usize` because the implementations would be platform-specific. `From` is also implemented from `f32` to `f64`. * `From<&Path>` and `From` are implemented for `Cow`. * `From` is implemented for `Box`, `Rc` and `Arc`. * `IntoIterator` is implemented for `&PathBuf` and `&Path`. * [`BinaryHeap` was refactored][1.6bh] for modest performance improvements. * Sorting slices that are already sorted [is 50% faster in some cases][1.6s]. Cargo ----- * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c]. * Cargo build scripts can specify their dependencies by emitting the [`rerun-if-changed`][1.6rr] key. * crates.io will reject publication of crates with dependencies that have a wildcard version constraint. Crates with wildcard dependencies were seen to cause a variety of problems, as described in [RFC 1241]. Since 1.5 publication of such crates has emitted a warning. * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the release folder. A variety of artifacts that Cargo failed to clean are now correctly deleted. Misc ---- * The `unreachable_code` lint [warns when a function call's argument diverges][1.6dv]. * The parser indicates [failures that may be caused by confusingly-similar Unicode characters][1.6uc] * Certain macro errors [are reported at definition time][1.6m], not expansion. Compatibility Notes ------------------- * The compiler no longer makes use of the [`RUST_PATH`][1.6rp] environment variable when locating crates. This was a pre-cargo feature for integrating with the package manager that was accidentally never removed. * [A number of bugs were fixed in the privacy checker][1.6p] that could cause previously-accepted code to break. * [Modules and unit/tuple structs may not share the same name][1.6ts]. * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple struct pattern syntax (`Foo(..)`) can no longer be used to match unit structs. This is a warning now, but will become an error in future releases. Patterns that share the same name as a const are now an error. * A bug was fixed that causes [rustc not to apply default type parameters][1.6xc] when resolving certain method implementations of traits defined in other crates. [1.6a]: https://github.com/rust-lang/rust/pull/29454 [1.6ae]: https://github.com/rust-lang/rust/pull/29770 [1.6bh]: https://github.com/rust-lang/rust/pull/29811 [1.6c]: https://github.com/rust-lang/cargo/pull/2192 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131 [1.6co]: http://doc.rust-lang.org/core/index.html [1.6dv]: https://github.com/rust-lang/rust/pull/30000 [1.6f]: https://github.com/rust-lang/rust/pull/29129 [1.6m]: https://github.com/rust-lang/rust/pull/29828 [1.6ms]: https://github.com/rust-lang/rust/pull/29604 [1.6p]: https://github.com/rust-lang/rust/pull/29726 [1.6rp]: https://github.com/rust-lang/rust/pull/30034 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134 [1.6s]: https://github.com/rust-lang/rust/pull/29675 [1.6ts]: https://github.com/rust-lang/rust/issues/21546 [1.6uc]: https://github.com/rust-lang/rust/pull/29837 [1.6us]: https://github.com/rust-lang/rust/pull/29383 [1.6xc]: https://github.com/rust-lang/rust/issues/30123 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain Version 1.5.0 (2015-12-10) ========================== * ~700 changes, numerous bugfixes Highlights ---------- * Stabilized APIs: [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`], [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`], [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`], [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`], [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`], [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`], [`Formatter::sign_minus`], [`Formatter::sign_plus`], [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`], [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`], [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`], [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`], [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`], [`Path::read_link`], [`Path::symlink_metadata`], [`Utf8Error::valid_up_to`], [`Vec::resize`], [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`], [`VecDeque::insert`], [`VecDeque::shrink_to_fit`], [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`], [`slice::split_first_mut`], [`slice::split_first`], [`slice::split_last_mut`], [`slice::split_last`], [`char::from_u32_unchecked`], [`fs::canonicalize`], [`str::MatchIndices`], [`str::RMatchIndices`], [`str::match_indices`], [`str::rmatch_indices`], [`str::slice_mut_unchecked`], [`string::ParseError`]. * Rust applications hosted on crates.io can be installed locally to `~/.cargo/bin` with the [`cargo install`] command. Among other things this makes it easier to augment Cargo with new subcommands: when a binary named e.g. `cargo-foo` is found in `$PATH` it can be invoked as `cargo foo`. * Crates with wildcard (`*`) dependencies will [emit warnings when published][1.5w]. In 1.6 it will no longer be possible to publish crates with wildcard dependencies. Breaking Changes ---------------- * The rules determining when a particular lifetime must outlive a particular value (known as '[dropck]') have been [modified to not rely on parametricity][1.5p]. * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`, and `Arc`][1.5a]. Because these smart pointer types implement `Deref`, this causes breakage in cases where the interior type contains methods of the same name. * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware that they could drop their content. Soundness fix. * All method invocations are [properly checked][1.5wf1] for [well-formedness][1.5wf2]. Soundness fix. * Traits whose supertraits contain `Self` are [not object safe][1.5o]. Soundness fix. * Target specifications support a [`no_default_libraries`][1.5nd] setting that controls whether `-nodefaultlibs` is passed to the linker, and in turn the `is_like_windows` setting no longer affects the `-nodefaultlibs` flag. * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds]. * The `#[inline]` and `#[repr]` attributes [can only appear in valid locations][1.5at]. * Native libraries linked from the local crate are [passed to the linker before native libraries from upstream crates][1.5nl]. * Two rarely-used attributes, `#[no_debug]` and `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg]. * Negation of unsigned integers, which has been a warning for several releases, [is now behind a feature gate and will generate errors][1.5nu]. * The parser accidentally accepted visibility modifiers on enum variants, a bug [which has been fixed][1.5ev]. * [A bug was fixed that allowed `use` statements to import unstable features][1.5use]. Language -------- * When evaluating expressions at compile-time that are not compile-time constants (const-evaluating expressions in non-const contexts), incorrect code such as overlong bitshifts and arithmetic overflow will [generate a warning instead of an error][1.5ce], delaying the error until runtime. This will allow the const-evaluator to be expanded in the future backwards-compatibly. * The `improper_ctypes` lint [no longer warns about using `isize` and `usize` in FFI][1.5ict]. Libraries --------- * `Arc` and `Rc` are [covariant with respect to `T` instead of invariant][1.5c]. * `Default` is [implemented for mutable slices][1.5d]. * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s]. * There are now `From` conversions [between floating point types][1.5f] where the conversions are lossless. * There are now `From` conversions [between integer types][1.5i] where the conversions are lossless. * [`fs::Metadata` implements `Clone`][1.5fs]. * The `parse` method [accepts a leading "+" when parsing integers][1.5pi]. * [`AsMut` is implemented for `Vec`][1.5am]. * The `clone_from` implementations for `String` and `BinaryHeap` [have been optimized][1.5cf] and no longer rely on the default impl. * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and `unsafe extern "C"` function types now [implement `Clone`, `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` for up to 12 arguments][1.5fp]. * [Dropping `Vec`s is much faster in unoptimized builds when the element types don't implement `Drop`][1.5dv]. * A bug that caused in incorrect behavior when [combining `VecDeque` with zero-sized types][1.5vdz] was resolved. * [`PartialOrd` for slices is faster][1.5po]. Miscellaneous ------------- * [Crate metadata size was reduced by 20%][1.5md]. * [Improvements to code generation reduced the size of libcore by 3.3 MB and rustc's memory usage by 18MB][1.5m]. * [Improvements to deref translation increased performance in unoptimized builds][1.5dr]. * Various errors in trait resolution [are deduplicated to only be reported once][1.5te]. * Rust has preliminary [support for rumprun kernels][1.5rr]. * Rust has preliminary [support for NetBSD on amd64][1.5na]. [1.5use]: https://github.com/rust-lang/rust/pull/28364 [1.5po]: https://github.com/rust-lang/rust/pull/28436 [1.5ev]: https://github.com/rust-lang/rust/pull/28442 [1.5nu]: https://github.com/rust-lang/rust/pull/28468 [1.5dr]: https://github.com/rust-lang/rust/pull/28491 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494 [1.5md]: https://github.com/rust-lang/rust/pull/28521 [1.5fg]: https://github.com/rust-lang/rust/pull/28522 [1.5dv]: https://github.com/rust-lang/rust/pull/28531 [1.5na]: https://github.com/rust-lang/rust/pull/28543 [1.5fp]: https://github.com/rust-lang/rust/pull/28560 [1.5rr]: https://github.com/rust-lang/rust/pull/28593 [1.5cf]: https://github.com/rust-lang/rust/pull/28602 [1.5nl]: https://github.com/rust-lang/rust/pull/28605 [1.5te]: https://github.com/rust-lang/rust/pull/28645 [1.5at]: https://github.com/rust-lang/rust/pull/28650 [1.5am]: https://github.com/rust-lang/rust/pull/28663 [1.5m]: https://github.com/rust-lang/rust/pull/28778 [1.5ict]: https://github.com/rust-lang/rust/pull/28779 [1.5a]: https://github.com/rust-lang/rust/pull/28811 [1.5pi]: https://github.com/rust-lang/rust/pull/28826 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md [1.5i]: https://github.com/rust-lang/rust/pull/28921 [1.5fs]: https://github.com/rust-lang/rust/pull/29021 [1.5f]: https://github.com/rust-lang/rust/pull/29129 [1.5ds]: https://github.com/rust-lang/rust/pull/29148 [1.5s]: https://github.com/rust-lang/rust/pull/29190 [1.5d]: https://github.com/rust-lang/rust/pull/29245 [1.5o]: https://github.com/rust-lang/rust/pull/29259 [1.5nd]: https://github.com/rust-lang/rust/pull/28578 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md [1.5wf1]: https://github.com/rust-lang/rust/pull/28669 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html [1.5c]: https://github.com/rust-lang/rust/pull/29110 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html Version 1.4.0 (2015-10-29) ========================== * ~1200 changes, numerous bugfixes Highlights ---------- * Windows builds targeting the 64-bit MSVC ABI and linker (instead of GNU) are now supported and recommended for use. Breaking Changes ---------------- * [Several changes have been made to fix type soundness and improve the behavior of associated types][sound]. See [RFC 1214]. Although we have mostly introduced these changes as warnings this release, to become errors next release, there are still some scenarios that will see immediate breakage. * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as line breaks in addition to `\n`][crlf]. * [Loans of `'static` lifetime extend to the end of a function][stat]. * [`str::parse` no longer introduces avoidable rounding error when parsing floating point numbers. Together with earlier changes to float formatting/output, "round trips" like f.to_string().parse() now preserve the value of f exactly. Additionally, leading plus signs are now accepted][fp3]. Language -------- * `use` statements that import multiple items [can now rename them][i], as in `use foo::{bar as kitten, baz as puppy}`. * [Binops work correctly on fat pointers][binfat]. * `pub extern crate`, which does not behave as expected, [issues a warning][pec] until a better solution is found. Libraries --------- * [Many APIs were stabilized][stab]: `>::into_string`, [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`], [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`], [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`], [`IntoRawFd::into_raw_fd`], [`IntoRawFd`], `IntoRawHandle::into_raw_handle`, `IntoRawHandle`, `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`], [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`], [`String::into_boxed_str`], [`TcpStream::read_timeout`], [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`], [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`], [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`], [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`, [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`], [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`], [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`], [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`], [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`], [`thread::sleep`]. * [Some APIs were deprecated][dep]: `BTreeMap::with_b`, `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`, `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`, `f64::from_str_radix`. * [Reverse-searching strings is faster with the 'two-way' algorithm][s]. * [`std::io::copy` allows `?Sized` arguments][cc]. * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all [override `count`, `nth` and `last` with an *O*(1) implementation][it]. * [`Default` is implemented for arrays up to `[T; 32]`][d]. * [`IntoRawFd` has been added to the Unix-specific prelude, `IntoRawSocket` and `IntoRawHandle` to the Windows-specific prelude][pr]. * [`Extend` and `FromIterator` where `T: Copy`][ext] as part of [RFC 839]. This will cause type inference breakage in rare situations. * [`BinaryHeap` implements `Debug`][bh2]. * [`Borrow` and `BorrowMut` are implemented for fixed-size arrays][bm]. * [`extern fn`s with the "Rust" and "C" ABIs implement common traits including `Eq`, `Ord`, `Debug`, `Hash`][fp]. * [String comparison is faster][faststr]. * `&mut T` where `T: std::fmt::Write` [also implements `std::fmt::Write`][mutw]. * [A stable regression in `VecDeque::push_back` and other capacity-altering methods that caused panics for zero-sized types was fixed][vd]. * [Function pointers implement traits for up to 12 parameters][fp2]. Miscellaneous ------------- * The compiler [no longer uses the 'morestack' feature to prevent stack overflow][mm]. Instead it uses guard pages and stack probes (though stack probes are not yet implemented on any platform but Windows). * [The compiler matches traits faster when projections are involved][p]. * The 'improper_ctypes' lint [no longer warns about use of `isize` and `usize`][ffi]. * [Cargo now displays useful information about what its doing during `cargo update`][cu]. [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html [bh2]: https://github.com/rust-lang/rust/pull/28156 [binfat]: https://github.com/rust-lang/rust/pull/28270 [bm]: https://github.com/rust-lang/rust/pull/28197 [cc]: https://github.com/rust-lang/rust/pull/27531 [crlf]: https://github.com/rust-lang/rust/pull/28034 [cu]: https://github.com/rust-lang/cargo/pull/1931 [d]: https://github.com/rust-lang/rust/pull/27825 [dep]: https://github.com/rust-lang/rust/pull/28339 [es]: https://github.com/rust-lang/rust/pull/27956 [ext]: https://github.com/rust-lang/rust/pull/28094 [faststr]: https://github.com/rust-lang/rust/pull/28338 [ffi]: https://github.com/rust-lang/rust/pull/28779 [fp]: https://github.com/rust-lang/rust/pull/28268 [fp2]: https://github.com/rust-lang/rust/pull/28560 [fp3]: https://github.com/rust-lang/rust/pull/27307 [i]: https://github.com/rust-lang/rust/pull/27451 [into2]: https://github.com/rust-lang/rust/pull/28039 [it]: https://github.com/rust-lang/rust/pull/27652 [mm]: https://github.com/rust-lang/rust/pull/27338 [mutw]: https://github.com/rust-lang/rust/pull/28368 [sound]: https://github.com/rust-lang/rust/pull/27641 [p]: https://github.com/rust-lang/rust/pull/27866 [pec]: https://github.com/rust-lang/rust/pull/28486 [pr]: https://github.com/rust-lang/rust/pull/27896 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md [s]: https://github.com/rust-lang/rust/pull/27474 [stab]: https://github.com/rust-lang/rust/pull/28339 [stat]: https://github.com/rust-lang/rust/pull/28321 [vd]: https://github.com/rust-lang/rust/pull/28494 Version 1.3.0 (2015-09-17) ============================== * ~900 changes, numerous bugfixes Highlights ---------- * The [new object lifetime defaults][nold] have been [turned on][nold2] after a cycle of warnings about the change. Now types like `&'a Box` (or `&'a Rc`, etc) will change from being interpreted as `&'a Box` to `&'a Box`. * [The Rustonomicon][nom] is a new book in the official documentation that dives into writing unsafe Rust. * The [`Duration`] API, [has been stabilized][ds]. This basic unit of timekeeping is employed by other std APIs, as well as out-of-tree time crates. Breaking Changes ---------------- * The [new object lifetime defaults][nold] have been [turned on][nold2] after a cycle of warnings about the change. * There is a known [regression][lr] in how object lifetime elision is interpreted, the proper solution for which is undetermined. * The `#[prelude_import]` attribute, an internal implementation detail, was accidentally stabilized previously. [It has been put behind the `prelude_import` feature gate][pi]. This change is believed to break no existing code. * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is [more sane for dynamically sized types][dst3]. Code that relied on the previous behavior is thought to be broken. * The `dropck` rules, which checks that destructors can't access destroyed values, [have been updated][dropck] to match the [RFC][dropckrfc]. This fixes some soundness holes, and as such will cause some previously-compiling code to no longer build. Language -------- * The [new object lifetime defaults][nold] have been [turned on][nold2] after a cycle of warnings about the change. * Semicolons may [now follow types and paths in macros](https://github.com/rust-lang/rust/pull/27000). * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is [more sane for dynamically sized types][dst3]. Code that relied on the previous behavior is not known to exist, and suspected to be broken. * `'static` variables [may now be recursive][st]. * `ref` bindings choose between [`Deref`] and [`DerefMut`] implementations correctly. * The `dropck` rules, which checks that destructors can't access destroyed values, [have been updated][dropck] to match the [RFC][dropckrfc]. Libraries --------- * The [`Duration`] API, [has been stabilized][ds], as well as the `std::time` module, which presently contains only `Duration`. * `Box` and `Box<[T]>` both implement `Clone`. * The owned C string, [`CString`], implements [`Borrow`] and the borrowed C string, [`CStr`], implements [`ToOwned`]. The two of these allow C strings to be borrowed and cloned in generic code. * [`CStr`] implements [`Debug`]. * [`AtomicPtr`] implements [`Debug`]. * [`Error`] trait objects [can be downcast to their concrete types][e] in many common configurations, using the [`is`], [`downcast`], [`downcast_ref`] and [`downcast_mut`] methods, similarly to the [`Any`] trait. * Searching for substrings now [employs the two-way algorithm][search] instead of doing a naive search. This gives major speedups to a number of methods, including [`contains`][sc], [`find`][sf], [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and [`ends_with`][sew] are also faster. * The performance of `PartialEq` for slices is [much faster][ps]. * The [`Hash`] trait offers the default method, [`hash_slice`], which is overridden and optimized by the implementations for scalars. * The [`Hasher`] trait now has a number of specialized `write_*` methods for primitive types, for efficiency. * The I/O-specific error type, [`std::io::Error`][ie], gained a set of methods for accessing the 'inner error', if any: [`get_ref`][iegr], [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation of [`std::error::Error::cause`][iec] also delegates to the inner error. * [`process::Child`][pc] gained the [`id`] method, which returns a `u32` representing the platform-specific process identifier. * The [`connect`] method on slices is deprecated, replaced by the new [`join`] method (note that both of these are on the *unstable* [`SliceConcatExt`] trait, but through the magic of the prelude are available to stable code anyway). * The [`Div`] operator is implemented for [`Wrapping`] types. * [`DerefMut` is implemented for `String`][dms]. * Performance of SipHash (the default hasher for `HashMap`) is [better for long data][sh]. * [`AtomicPtr`] implements [`Send`]. * The [`read_to_end`] implementations for [`Stdin`] and [`File`] are now [specialized to use uninitialized buffers for increased performance][rte]. * Lifetime parameters of foreign functions [are now resolved properly][f]. Misc ---- * Rust can now, with some coercion, [produce programs that run on Windows XP][xp], though XP is not considered a supported platform. * Porting Rust on Windows from the GNU toolchain to MSVC continues ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not recommended for use in 1.3, though should be fully-functional in the [64-bit 1.4 beta][b14]. * On Fedora-based systems installation will [properly configure the dynamic linker][fl]. * The compiler gained many new extended error descriptions, which can be accessed with the `--explain` flag. * The `dropck` pass, which checks that destructors can't access destroyed values, [has been rewritten][27261]. This fixes some soundness holes, and as such will cause some previously-compiling code to no longer build. * `rustc` now uses [LLVM to write archive files where possible][ar]. Eventually this will eliminate the compiler's dependency on the ar utility. * Rust has [preliminary support for i686 FreeBSD][26959] (it has long supported FreeBSD on x86_64). * The [`unused_mut`][lum], [`unconditional_recursion`][lur], [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are more strict. * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!` will kill the process instead of leaking][nlp]. [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end [ar]: https://github.com/rust-lang/rust/pull/26926 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi [dms]: https://github.com/rust-lang/rust/pull/26241 [27261]: https://github.com/rust-lang/rust/pull/27261 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md [ds]: https://github.com/rust-lang/rust/pull/26818 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html [dst3]: https://github.com/rust-lang/rust/pull/27351 [e]: https://github.com/rust-lang/rust/pull/24793 [f]: https://github.com/rust-lang/rust/pull/26588 [26959]: https://github.com/rust-lang/rust/pull/26959 [fl]: https://github.com/rust-lang/rust-installer/pull/41 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner [lic]: https://github.com/rust-lang/rust/pull/26583 [lnu]: https://github.com/rust-lang/rust/pull/27026 [lr]: https://github.com/rust-lang/rust/issues/27248 [lum]: https://github.com/rust-lang/rust/pull/26378 [lur]: https://github.com/rust-lang/rust/pull/26783 [nlp]: https://github.com/rust-lang/rust/pull/27176 [nold2]: https://github.com/rust-lang/rust/pull/27045 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md [nom]: http://doc.rust-lang.org/nightly/nomicon/ [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html [pi]: https://github.com/rust-lang/rust/pull/26699 [ps]: https://github.com/rust-lang/rust/pull/26884 [rte]: https://github.com/rust-lang/rust/pull/26950 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains [search]: https://github.com/rust-lang/rust/pull/26327 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find [sh]: https://github.com/rust-lang/rust/pull/27280 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with [st]: https://github.com/rust-lang/rust/pull/26630 [win1]: https://github.com/rust-lang/rust/pull/26569 [win2]: https://github.com/rust-lang/rust/pull/26741 [win3]: https://github.com/rust-lang/rust/pull/26741 [win4]: https://github.com/rust-lang/rust/pull/27210 [xp]: https://github.com/rust-lang/rust/pull/26569 Version 1.2.0 (2015-08-07) ========================== * ~1200 changes, numerous bugfixes Highlights ---------- * [Dynamically-sized-type coercions][dst] allow smart pointer types like `Rc` to contain types without a fixed size, arrays and trait objects, finally enabling use of `Rc<[T]>` and completing the implementation of DST. * [Parallel codegen][parcodegen] is now working again, which can substantially speed up large builds in debug mode; It also gets another ~33% speedup when bootstrapping on a 4 core machine (using 8 jobs). It's not enabled by default, but will be "in the near future". It can be activated with the `-C codegen-units=N` flag to `rustc`. * This is the first release with [experimental support for linking with the MSVC linker and lib C on Windows (instead of using the GNU variants via MinGW)][win]. It is yet recommended only for the most intrepid Rustaceans. * Benchmark compilations are showing a 30% improvement in bootstrapping over 1.1. Breaking Changes ---------------- * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do unicode case mapping, which is a previously-planned change in behavior and considered a bugfix. * [`mem::align_of`] now specifies [the *minimum alignment* for T][align], which is usually the alignment programs are interested in, and the same value reported by clang's `alignof`. [`mem::min_align_of`] is deprecated. This is not known to break real code. * [The `#[packed]` attribute is no longer silently accepted by the compiler][packed]. This attribute did nothing and code that mentioned it likely did not work as intended. * Associated type defaults are [now behind the `associated_type_defaults` feature gate][ad]. In 1.1 associated type defaults *did not work*, but could be mentioned syntactically. As such this breakage has minimal impact. Language -------- * Patterns with `ref mut` now correctly invoke [`DerefMut`] when matching against dereferenceable values. Libraries --------- * The [`Extend`] trait, which grows a collection from an iterator, is implemented over iterators of references, for `String`, `Vec`, `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`, `BTreeSet` and `BTreeMap`. [RFC][extend-rfc]. * The [`iter::once`] function returns an iterator that yields a single element, and [`iter::empty`] returns an iterator that yields no elements. * The [`matches`] and [`rmatches`] methods on `str` return iterators over substring matches. * [`Cell`] and [`RefCell`] both implement `Eq`. * A number of methods for wrapping arithmetic are added to the integral types, [`wrapping_div`], [`wrapping_rem`], [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in addition to the existing [`wrapping_add`], [`wrapping_sub`], and [`wrapping_mul`] methods, and alternatives to the [`Wrapping`] type.. It is illegal for the default arithmetic operations in Rust to overflow; the desire to wrap must be explicit. * The `{:#?}` formatting specifier [displays the alternate, pretty-printed][debugfmt] form of the `Debug` formatter. This feature was actually introduced prior to 1.0 with little fanfare. * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait for writing data to formatted strings, similar to [`io::Write`]. * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`], [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These are used by code generators to emit implementations of [`Debug`]. * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow] methods that convert case, following Unicode case mapping. * It is now easier to handle poisoned locks. The [`PoisonError`] type, returned by failing lock operations, exposes `into_inner`, `get_ref`, and `get_mut`, which all give access to the inner lock guard, and allow the poisoned lock to continue to operate. The `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a poisoned lock without attempting to take the lock. * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`]. On Windows the `FromRawHandle` trait is implemented for `Stdio`, and `AsRawHandle` for `ChildStdin`, `ChildStdout`, `ChildStderr`. * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates malformed input. Misc ---- * `rustc` employs smarter heuristics for guessing at [typos]. * `rustc` emits more efficient code for [no-op conversions between unsafe pointers][nop]. * Fat pointers are now [passed in pairs of immediate arguments][fat], resulting in faster compile times and smaller code. [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/ [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html [align]: https://github.com/rust-lang/rust/pull/25646 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html [typos]: https://github.com/rust-lang/rust/pull/26087 [nop]: https://github.com/rust-lang/rust/pull/26336 [fat]: https://github.com/rust-lang/rust/pull/26411 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md [parcodegen]: https://github.com/rust-lang/rust/pull/26018 [packed]: https://github.com/rust-lang/rust/pull/25541 [ad]: https://github.com/rust-lang/rust/pull/27382 [win]: https://github.com/rust-lang/rust/pull/25350 Version 1.1.0 (2015-06-25) ========================= * ~850 changes, numerous bugfixes Highlights ---------- * The [`std::fs` module has been expanded][fs] to expand the set of functionality exposed: * `DirEntry` now supports optimizations like `file_type` and `metadata` which don't incur a syscall on some platforms. * A `symlink_metadata` function has been added. * The `fs::Metadata` structure now lowers to its OS counterpart, providing access to all underlying information. * The compiler now contains extended explanations of many errors. When an error with an explanation occurs the compiler suggests using the `--explain` flag to read the explanation. Error explanations are also [available online][err-index]. * Thanks to multiple [improvements][sk] to [type checking][pre], as well as other work, the time to bootstrap the compiler decreased by 32%. Libraries --------- * The [`str::split_whitespace`] method splits a string on unicode whitespace boundaries. * On both Windows and Unix, new extension traits provide conversion of I/O types to and from the underlying system handles. On Unix, these traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle` and `AsRawHandle`. These are implemented for `File`, `TcpStream`, `TcpListener`, and `UpdSocket`. Further implementations for `std::process` will be stabilized later. * On Unix, [`std::os::unix::symlink`] creates symlinks. On Windows, symlinks can be created with `std::os::windows::symlink_dir` and `std::os::windows::symlink_file`. * The `mpsc::Receiver` type can now be converted into an iterator with `into_iter` on the [`IntoIterator`] trait. * `Ipv4Addr` can be created from `u32` with the `From` implementation of the [`From`] trait. * The `Debug` implementation for `RangeFull` [creates output that is more consistent with other implementations][rf]. * [`Debug` is implemented for `File`][file]. * The `Default` implementation for `Arc` [no longer requires `Sync + Send`][arc]. * [The `Iterator` methods `count`, `nth`, and `last` have been overridden for slices to have *O*(1) performance instead of *O*(*n*)][si]. * Incorrect handling of paths on Windows has been improved in both the compiler and the standard library. * [`AtomicPtr` gained a `Default` implementation][ap]. * In accordance with Rust's policy on arithmetic overflow `abs` now [panics on overflow when debug assertions are enabled][abs]. * The [`Cloned`] iterator, which was accidentally left unstable for 1.0 [has been stabilized][c]. * The [`Incoming`] iterator, which iterates over incoming TCP connections, and which was accidentally unnamable in 1.0, [is now properly exported][inc]. * [`BinaryHeap`] no longer corrupts itself [when functions called by `sift_up` or `sift_down` panic][bh]. * The [`split_off`] method of `LinkedList` [no longer corrupts the list in certain scenarios][ll]. Misc ---- * Type checking performance [has improved notably][sk] with [multiple improvements][pre]. * The compiler [suggests code changes][ch] for more errors. * rustc and it's build system have experimental support for [building toolchains against MUSL][m] instead of glibc on Linux. * The compiler defines the `target_env` cfg value, which is used for distinguishing toolchains that are otherwise for the same platform. Presently this is set to `gnu` for common GNU Linux targets and for MinGW targets, and `musl` for MUSL Linux targets. * The [`cargo rustc`][crc] command invokes a build with custom flags to rustc. * [Android executables are always position independent][pie]. * [The `drop_with_repr_extern` lint warns about mixing `repr(C)` with `Drop`][24935]. [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html [rf]: https://github.com/rust-lang/rust/pull/24491 [err-index]: https://doc.rust-lang.org/error-index.html [sk]: https://github.com/rust-lang/rust/pull/24615 [pre]: https://github.com/rust-lang/rust/pull/25323 [file]: https://github.com/rust-lang/rust/pull/24598 [ch]: https://github.com/rust-lang/rust/pull/24683 [arc]: https://github.com/rust-lang/rust/pull/24695 [si]: https://github.com/rust-lang/rust/pull/24701 [ap]: https://github.com/rust-lang/rust/pull/24834 [m]: https://github.com/rust-lang/rust/pull/24777 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md [crc]: https://github.com/rust-lang/cargo/pull/1568 [pie]: https://github.com/rust-lang/rust/pull/24953 [abs]: https://github.com/rust-lang/rust/pull/25441 [c]: https://github.com/rust-lang/rust/pull/25496 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html [inc]: https://github.com/rust-lang/rust/pull/25522 [bh]: https://github.com/rust-lang/rust/pull/25856 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html [ll]: https://github.com/rust-lang/rust/pull/26022 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off [24935]: https://github.com/rust-lang/rust/pull/24935 Version 1.0.0 (2015-05-15) ======================== * ~1500 changes, numerous bugfixes Highlights ---------- * The vast majority of the standard library is now `#[stable]`. It is no longer possible to use unstable features with a stable build of the compiler. * Many popular crates on [crates.io] now work on the stable release channel. * Arithmetic on basic integer types now [checks for overflow in debug builds][overflow]. Language -------- * Several [restrictions have been added to trait coherence][coh] in order to make it easier for upstream authors to change traits without breaking downstream code. * Digits of binary and octal literals are [lexed more eagerly][lex] to improve error messages and macro behavior. For example, `0b1234` is now lexed as `0b1234` instead of two tokens, `0b1` and `234`. * Trait bounds [are always invariant][inv], eliminating the need for the `PhantomFn` and `MarkerTrait` lang items, which have been removed. * ["-" is no longer a valid character in crate names][cr], the `extern crate "foo" as bar` syntax has been replaced with `extern crate foo as bar`, and Cargo now automatically translates "-" in *package* names to underscore for the crate name. * [Lifetime shadowing is an error][lt]. * [`Send` no longer implies `'static`][send-rfc]. * [UFCS now supports trait-less associated paths][moar-ufcs] like `MyType::default()`. * Primitive types [now have inherent methods][prim-inherent], obviating the need for extension traits like `SliceExt`. * Methods with `Self: Sized` in their `where` clause are [considered object-safe][self-sized], allowing many extension traits like `IteratorExt` to be merged into the traits they extended. * You can now [refer to associated types][assoc-where] whose corresponding trait bounds appear only in a `where` clause. * The final bits of [OIBIT landed][oibit-final], meaning that traits like `Send` and `Sync` are now library-defined. * A [Reflect trait][reflect] was introduced, which means that downcasting via the `Any` trait is effectively limited to concrete types. This helps retain the potentially-important "parametricity" property: generic code cannot behave differently for different type arguments except in minor ways. * The `unsafe_destructor` feature is now deprecated in favor of the [new `dropck`][rfc769]. This change is a major reduction in unsafe code. Libraries --------- * The `thread_local` module [has been renamed to `std::thread`][th]. * The methods of `IteratorExt` [have been moved to the `Iterator` trait itself][23300]. * Several traits that implement Rust's conventions for type conversions, `AsMut`, `AsRef`, `From`, and `Into` have been [centralized in the `std::convert` module][con]. * The `FromError` trait [was removed in favor of `From`][fe]. * The basic sleep function [has moved to `std::thread::sleep_ms`][slp]. * The `splitn` function now takes an `n` parameter that represents the number of items yielded by the returned iterator [instead of the number of 'splits'][spl]. * [On Unix, all file descriptors are `CLOEXEC` by default][clo]. * [Derived implementations of `PartialOrd` now order enums according to their explicitly-assigned discriminants][po]. * [Methods for searching strings are generic over `Pattern`s][pat], implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and some others. * [In method resolution, object methods are resolved before inherent methods][meth]. * [`String::from_str` has been deprecated in favor of the `From` impl, `String::from`][24517]. * [`io::Error` implements `Sync`][ios]. * [The `words` method on `&str` has been replaced with `split_whitespace`][sw], to avoid answering the tricky question, 'what is a word?' * The new path and IO modules are complete and `#[stable]`. This was the major library focus for this cycle. * The path API was [revised][path-normalize] to normalize `.`, adjusting the tradeoffs in favor of the most common usage. * A large number of remaining APIs in `std` were also stabilized during this cycle; about 75% of the non-deprecated API surface is now stable. * The new [string pattern API][string-pattern] landed, which makes the string slice API much more internally consistent and flexible. * A new set of [generic conversion traits][conversion] replaced many existing ad hoc traits. * Generic numeric traits were [completely removed][num-traits]. This was made possible thanks to inherent methods for primitive types, and the removal gives maximal flexibility for designing a numeric hierarchy in the future. * The `Fn` traits are now related via [inheritance][fn-inherit] and provide ergonomic [blanket implementations][fn-blanket]. * The `Index` and `IndexMut` traits were changed to [take the index by value][index-value], enabling code like `hash_map["string"]` to work. * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all `Copy` data is known to be `Clone` as well. Misc ---- * Many errors now have extended explanations that can be accessed with the `--explain` flag to `rustc`. * Many new examples have been added to the standard library documentation. * rustdoc has received a number of improvements focused on completion and polish. * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink]. * Much headway was made on ecosystem-wide CI, making it possible to [compare builds for breakage][ci-compare]. [crates.io]: http://crates.io [clo]: https://github.com/rust-lang/rust/pull/24034 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md [con]: https://github.com/rust-lang/rust/pull/23875 [cr]: https://github.com/rust-lang/rust/pull/23419 [fe]: https://github.com/rust-lang/rust/pull/23879 [23300]: https://github.com/rust-lang/rust/pull/23300 [inv]: https://github.com/rust-lang/rust/pull/23938 [ios]: https://github.com/rust-lang/rust/pull/24133 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md [lt]: https://github.com/rust-lang/rust/pull/24057 [meth]: https://github.com/rust-lang/rust/pull/24056 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md [po]: https://github.com/rust-lang/rust/pull/24270 [24517]: https://github.com/rust-lang/rust/pull/24517 [slp]: https://github.com/rust-lang/rust/pull/23949 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971 [self-sized]: https://github.com/rust-lang/rust/pull/22301 [assoc-where]: https://github.com/rust-lang/rust/pull/22512 [string-pattern]: https://github.com/rust-lang/rust/pull/22466 [oibit-final]: https://github.com/rust-lang/rust/pull/21689 [reflect]: https://github.com/rust-lang/rust/pull/23712 [conversion]: https://github.com/rust-lang/rfcs/pull/529 [num-traits]: https://github.com/rust-lang/rust/pull/23549 [index-value]: https://github.com/rust-lang/rust/pull/23601 [rfc769]: https://github.com/rust-lang/rfcs/pull/769 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee [fn-inherit]: https://github.com/rust-lang/rust/pull/23282 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895 [copy-clone]: https://github.com/rust-lang/rust/pull/23860 [path-normalize]: https://github.com/rust-lang/rust/pull/23229 Version 1.0.0-alpha.2 (2015-02-20) ===================================== * ~1300 changes, numerous bugfixes * Highlights * The various I/O modules were [overhauled][io-rfc] to reduce unnecessary abstractions and provide better interoperation with the underlying platform. The old `io` module remains temporarily at `std::old_io`. * The standard library now [participates in feature gating][feat], so use of unstable libraries now requires a `#![feature(...)]` attribute. The impact of this change is [described on the forum][feat-forum]. [RFC][feat-rfc]. * Language * `for` loops [now operate on the `IntoIterator` trait][into], which eliminates the need to call `.iter()`, etc. to iterate over collections. There are some new subtleties to remember though regarding what sort of iterators various types yield, in particular that `for foo in bar { }` yields values from a move iterator, destroying the original collection. [RFC][into-rfc]. * Objects now have [default lifetime bounds][obj], so you don't have to write `Box` when you don't care about storing references. [RFC][obj-rfc]. * In types that implement `Drop`, [lifetimes must outlive the value][drop]. This will soon make it possible to safely implement `Drop` for types where `#[unsafe_destructor]` is now required. Read the [gorgeous RFC][drop-rfc] for details. * The fully qualified ::X syntax lets you set the Self type for a trait method or associated type. [RFC][ufcs-rfc]. * References to types that implement `Deref` now [automatically coerce to references][deref] to the dereferenced type `U`, e.g. `&T where T: Deref` automatically coerces to `&U`. This should eliminate many unsightly uses of `&*`, as when converting from references to vectors into references to slices. [RFC][deref-rfc]. * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`, `|:|`) is obsolete and closure kind is inferred from context. * [`Self` is a keyword][Self]. * Libraries * The `Show` and `String` formatting traits [have been renamed][fmt] to `Debug` and `Display` to more clearly reflect their related purposes. Automatically getting a string conversion to use with `format!("{:?}", something_to_debug)` is now written `#[derive(Debug)]`. * Abstract [OS-specific string types][osstr], `std::ff::{OsString, OsStr}`, provide strings in platform-specific encodings for easier interop with system APIs. [RFC][osstr-rfc]. * The `boxed::into_raw` and `Box::from_raw` functions [convert between `Box` and `*mut T`][boxraw], a common pattern for creating raw pointers. * Tooling * Certain long error messages of the form 'expected foo found bar' are now [split neatly across multiple lines][multiline]. Examples in the PR. * On Unix Rust can be [uninstalled][un] by running `/usr/local/lib/rustlib/uninstall.sh`. * The `#[rustc_on_unimplemented]` attribute, requiring the 'on_unimplemented' feature, lets rustc [display custom error messages when a trait is expected to be implemented for a type but is not][onun]. * Misc * Rust is tested against a [LALR grammar][lalr], which parses almost all the Rust files that rustc does. [boxraw]: https://github.com/rust-lang/rust/pull/21318 [close]: https://github.com/rust-lang/rust/pull/21843 [deref]: https://github.com/rust-lang/rust/pull/21351 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md [drop]: https://github.com/rust-lang/rust/pull/21972 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md [feat]: https://github.com/rust-lang/rust/pull/21248 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md [fmt]: https://github.com/rust-lang/rust/pull/21457 [into]: https://github.com/rust-lang/rust/pull/20790 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md [lalr]: https://github.com/rust-lang/rust/pull/21452 [multiline]: https://github.com/rust-lang/rust/pull/19870 [obj]: https://github.com/rust-lang/rust/pull/22230 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md [onun]: https://github.com/rust-lang/rust/pull/20889 [osstr]: https://github.com/rust-lang/rust/pull/21488 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md [Self]: https://github.com/rust-lang/rust/pull/22158 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md [un]: https://github.com/rust-lang/rust/pull/22256 Version 1.0.0-alpha (2015-01-09) ================================== * ~2400 changes, numerous bugfixes * Highlights * The language itself is considered feature complete for 1.0, though there will be many usability improvements and bugfixes before the final release. * Nearly 50% of the public API surface of the standard library has been declared 'stable'. Those interfaces are unlikely to change before 1.0. * The long-running debate over integer types has been [settled][ints]: Rust will ship with types named `isize` and `usize`, rather than `int` and `uint`, for pointer-sized integers. Guidelines will be rolled out during the alpha cycle. * Most crates that are not `std` have been moved out of the Rust distribution into the Cargo ecosystem so they can evolve separately and don't need to be stabilized as quickly, including 'time', 'getopts', 'num', 'regex', and 'term'. * Documentation continues to be expanded with more API coverage, more examples, and more in-depth explanations. The guides have been consolidated into [The Rust Programming Language][trpl]. * "[Rust By Example][rbe]" is now maintained by the Rust team. * All official Rust binary installers now come with [Cargo], the Rust package manager. * Language * Closures have been [completely redesigned][unboxed] to be implemented in terms of traits, can now be used as generic type bounds and thus monomorphized and inlined, or via an opaque pointer (boxed) as in the old system. The new system is often referred to as 'unboxed' closures. * Traits now support [associated types][assoc], allowing families of related types to be defined together and used generically in powerful ways. * Enum variants are [namespaced by their type names][enum]. * [`where` clauses][where] provide a more versatile and attractive syntax for specifying generic bounds, though the previous syntax remains valid. * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred numeric types. * Rust [no longer has a runtime][rt] of any description, and only supports OS threads, not green threads. * At long last, Rust has been overhauled for 'dynamically-sized types' ([DST]), which integrates 'fat pointers' (object types, arrays, and `str`) more deeply into the type system, making it more consistent. * Rust now has a general [range syntax][range], `i..j`, `i..`, and `..j` that produce range types and which, when combined with the `Index` operator and multidispatch, leads to a convenient slice notation, `[i..j]`. * The new range syntax revealed an ambiguity in the fixed-length array syntax, so now fixed length arrays [are written `[T; N]`][arrays]. * The `Copy` trait is no longer implemented automatically. Unsafe pointers no longer implement `Sync` and `Send` so types containing them don't automatically either. `Sync` and `Send` are now 'unsafe traits' so one can "forcibly" implement them via `unsafe impl` if a type confirms to the requirements for them even though the internals do not (e.g. structs containing unsafe pointers like `Arc`). These changes are intended to prevent some footguns and are collectively known as [opt-in built-in traits][oibit] (though `Sync` and `Send` will soon become pure library types unknown to the compiler). * Operator traits now take their operands [by value][ops], and comparison traits can use multidispatch to compare one type against multiple other types, allowing e.g. `String` to be compared with `&str`. * `if let` and `while let` are no longer feature-gated. * Rust has adopted a more [uniform syntax for escaping unicode characters][unicode]. * `macro_rules!` [has been declared stable][mac]. Though it is a flawed system it is sufficiently popular that it must be usable for 1.0. Effort has gone into [future-proofing][mac-future] it in ways that will allow other macro systems to be developed in parallel, and won't otherwise impact the evolution of the language. * The prelude has been [pared back significantly][prelude] such that it is the minimum necessary to support the most pervasive code patterns, and through [generalized where clauses][where] many of the prelude extension traits have been consolidated. * Rust's rudimentary reflection [has been removed][refl], as it incurred too much code generation for little benefit. * [Struct variants][structvars] are no longer feature-gated. * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also known as 'higher-ranked trait bounds', this crucially allows unboxed closures to work. * Macros invocations surrounded by parens or square brackets and not terminated by a semicolon are [parsed as expressions][macros], which makes expressions like `vec![1i32, 2, 3].len()` work as expected. * Trait objects now implement their traits automatically, and traits that can be coerced to objects now must be [object safe][objsafe]. * Automatically deriving traits is now done with `#[derive(...)]` not `#[deriving(...)]` for [consistency with other naming conventions][derive]. * Importing the containing module or enum at the same time as items or variants they contain is [now done with `self` instead of `mod`][self], as in use `foo::{self, bar}` * Glob imports are no longer feature-gated. * The `box` operator and `box` patterns have been feature-gated pending a redesign. For now unique boxes should be allocated like other containers, with `Box::new`. * Libraries * A [series][coll1] of [efforts][coll2] to establish [conventions][coll3] for collections types has resulted in API improvements throughout the standard library. * New [APIs for error handling][err] provide ergonomic interop between error types, and [new conventions][err-conv] describe more clearly the recommended error handling strategies in Rust. * The `fail!` macro has been renamed to [`panic!`][panic] so that it is easier to discuss failure in the context of error handling without making clarifications as to whether you are referring to the 'fail' macro or failure more generally. * On Linux, `OsRng` prefers the new, more reliable `getrandom` syscall when available. * The 'serialize' crate has been renamed 'rustc-serialize' and moved out of the distribution to Cargo. Although it is widely used now, it is expected to be superseded in the near future. * The `Show` formatter, typically implemented with `#[derive(Show)]` is [now requested with the `{:?}` specifier][show] and is intended for use by all types, for uses such as `println!` debugging. The new `String` formatter must be implemented by hand, uses the `{}` specifier, and is intended for full-fidelity conversions of things that can logically be represented as strings. * Tooling * [Flexible target specification][flex] allows rustc's code generation to be configured to support otherwise-unsupported platforms. * Rust comes with rust-gdb and rust-lldb scripts that launch their respective debuggers with Rust-appropriate pretty-printing. * The Windows installation of Rust is distributed with the MinGW components currently required to link binaries on that platform. * Misc * Nullable enum optimizations have been extended to more types so that e.g. `Option>` and `Option` take up no more space than the inner types themselves. * Work has begun on supporting AArch64. [Cargo]: https://crates.io [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/ [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md [mac-future]: https://github.com/rust-lang/rfcs/pull/550 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/ [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871 [trpl]: https://doc.rust-lang.org/book/index.html [rbe]: http://rustbyexample.com/ Version 0.12.0 (2014-10-09) ============================= * ~1900 changes, numerous bugfixes * Highlights * The introductory documentation (now called The Rust Guide) has been completely rewritten, as have a number of supplementary guides. * Rust's package manager, Cargo, continues to improve and is sometimes considered to be quite awesome. * Many API's in `std` have been reviewed and updated for consistency with the in-development Rust coding guidelines. The standard library documentation tracks stabilization progress. * Minor libraries have been moved out-of-tree to the rust-lang org on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can be installed with Cargo. * Lifetime elision allows lifetime annotations to be left off of function declarations in many common scenarios. * Rust now works on 64-bit Windows. * Language * Indexing can be overloaded with the `Index` and `IndexMut` traits. * The `if let` construct takes a branch only if the `let` pattern matches, currently behind the 'if_let' feature gate. * 'where clauses', a more flexible syntax for specifying trait bounds that is more aesthetic, have been added for traits and free functions. Where clauses will in the future make it possible to constrain associated types, which would be impossible with the existing syntax. * A new slicing syntax (e.g. `[0..4]`) has been introduced behind the 'slicing_syntax' feature gate, and can be overloaded with the `Slice` or `SliceMut` traits. * The syntax for matching of sub-slices has been changed to use a postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for consistency with other uses of `..` and to future-proof potential additional uses of the syntax. * The syntax for matching inclusive ranges in patterns has changed from `0..3` to `0...4` to be consistent with the exclusive range syntax for slicing. * Matching of sub-slices in non-tail positions (e.g. `[a.., b, c]`) has been put behind the 'advanced_slice_patterns' feature gate and may be removed in the future. * Components of tuples and tuple structs can be extracted using the `value.0` syntax, currently behind the `tuple_indexing` feature gate. * The `#[crate_id]` attribute is no longer supported; versioning is handled by the package manager. * Renaming crate imports are now written `extern crate foo as bar` instead of `extern crate bar = foo`. * Renaming use statements are now written `use foo as bar` instead of `use bar = foo`. * `let` and `match` bindings and argument names in macros are now hygienic. * The new, more efficient, closure types ('unboxed closures') have been added under a feature gate, 'unboxed_closures'. These will soon replace the existing closure types, once higher-ranked trait lifetimes are added to the language. * `move` has been added as a keyword, for indicating closures that capture by value. * Mutation and assignment is no longer allowed in pattern guards. * Generic structs and enums can now have trait bounds. * The `Share` trait is now called `Sync` to free up the term 'shared' to refer to 'shared reference' (the default reference type. * Dynamically-sized types have been mostly implemented, unifying the behavior of fat-pointer types with the rest of the type system. * As part of dynamically-sized types, the `Sized` trait has been introduced, which qualifying types implement by default, and which type parameters expect by default. To specify that a type parameter does not need to be sized, write ``. Most types are `Sized`, notable exceptions being unsized arrays (`[T]`) and trait types. * Closures can return `!`, as in `|| -> !` or `proc() -> !`. * Lifetime bounds can now be applied to type parameters and object types. * The old, reference counted GC type, `Gc` which was once denoted by the `@` sigil, has finally been removed. GC will be revisited in the future. * Libraries * Library documentation has been improved for a number of modules. * Bit-vectors, collections::bitv has been modernized. * The url crate is deprecated in favor of http://github.com/servo/rust-url, which can be installed with Cargo. * Most I/O stream types can be cloned and subsequently closed from a different thread. * A `std::time::Duration` type has been added for use in I/O methods that rely on timers, as well as in the 'time' crate's `Timespec` arithmetic. * The runtime I/O abstraction layer that enabled the green thread scheduler to do non-thread-blocking I/O has been removed, along with the libuv-based implementation employed by the green thread scheduler. This will greatly simplify the future I/O work. * `collections::btree` has been rewritten to have a more idiomatic and efficient design. * Tooling * rustdoc output now indicates the stability levels of API's. * The `--crate-name` flag can specify the name of the crate being compiled, like `#[crate_name]`. * The `-C metadata` specifies additional metadata to hash into symbol names, and `-C extra-filename` specifies additional information to put into the output filename, for use by the package manager for versioning. * debug info generation has continued to improve and should be more reliable under both gdb and lldb. * rustc has experimental support for compiling in parallel using the `-C codegen-units` flag. * rustc no longer encodes rpath information into binaries by default. * Misc * Stack usage has been optimized with LLVM lifetime annotations. * Official Rust binaries on Linux are more compatible with older kernels and distributions, built on CentOS 5.10. Version 0.11.0 (2014-07-02) ========================== * ~1700 changes, numerous bugfixes * Language * ~[T] has been removed from the language. This type is superseded by the Vec type. * ~str has been removed from the language. This type is superseded by the String type. * ~T has been removed from the language. This type is superseded by the Box type. * @T has been removed from the language. This type is superseded by the standard library's std::gc::Gc type. * Struct fields are now all private by default. * Vector indices and shift amounts are both required to be a `uint` instead of any integral type. * Byte character, byte string, and raw byte string literals are now all supported by prefixing the normal literal with a `b`. * Multiple ABIs are no longer allowed in an ABI string * The syntax for lifetimes on closures/procedures has been tweaked slightly: `<'a>|A, B|: 'b + K -> T` * Floating point modulus has been removed from the language; however it is still provided by a library implementation. * Private enum variants are now disallowed. * The `priv` keyword has been removed from the language. * A closure can no longer be invoked through a &-pointer. * The `use foo, bar, baz;` syntax has been removed from the language. * The transmute intrinsic no longer works on type parameters. * Statics now allow blocks/items in their definition. * Trait bounds are separated from objects with + instead of : now. * Objects can no longer be read while they are mutably borrowed. * The address of a static is now marked as insignificant unless the #[inline(never)] attribute is placed it. * The #[unsafe_destructor] attribute is now behind a feature gate. * Struct literals are no longer allowed in ambiguous positions such as if, while, match, and for..in. * Declaration of lang items and intrinsics are now feature-gated by default. * Integral literals no longer default to `int`, and floating point literals no longer default to `f64`. Literals must be suffixed with an appropriate type if inference cannot determine the type of the literal. * The Box type is no longer implicitly borrowed to &mut T. * Procedures are now required to not capture borrowed references. * Libraries * The standard library is now a "facade" over a number of underlying libraries. This means that development on the standard library should be speedier due to smaller crates, as well as a clearer line between all dependencies. * A new library, libcore, lives under the standard library's facade which is Rust's "0-assumption" library, suitable for embedded and kernel development for example. * A regex crate has been added to the standard distribution. This crate includes statically compiled regular expressions. * The unwrap/unwrap_err methods on Result require a Show bound for better error messages. * The return types of the std::comm primitives have been centralized around the Result type. * A number of I/O primitives have gained the ability to time out their operations. * A number of I/O primitives have gained the ability to close their reading/writing halves to cancel pending operations. * Reverse iterator methods have been removed in favor of `rev()` on their forward-iteration counterparts. * A bitflags! macro has been added to enable easy interop with C and management of bit flags. * A debug_assert! macro is now provided which is disabled when `--cfg ndebug` is passed to the compiler. * A graphviz crate has been added for creating .dot files. * The std::cast module has been migrated into std::mem. * The std::local_data api has been migrated from freestanding functions to being based on methods. * The Pod trait has been renamed to Copy. * jemalloc has been added as the default allocator for types. * The API for allocating memory has been changed to use proper alignment and sized deallocation * Connecting a TcpStream or binding a TcpListener is now based on a string address and a u16 port. This allows connecting to a hostname as opposed to an IP. * The Reader trait now contains a core method, read_at_least(), which correctly handles many repeated 0-length reads. * The process-spawning API is now centered around a builder-style Command struct. * The :? printing qualifier has been moved from the standard library to an external libdebug crate. * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd have been renamed to Eq/Ord. * The select/plural methods have been removed from format!. The escapes for { and } have also changed from \{ and \} to {{ and }}, respectively. * The TaskBuilder API has been re-worked to be a true builder, and extension traits for spawning native/green tasks have been added. * Tooling * All breaking changes to the language or libraries now have their commit message annotated with `[breaking-change]` to allow for easy discovery of breaking changes. * The compiler will now try to suggest how to annotate lifetimes if a lifetime-related error occurs. * Debug info continues to be improved greatly with general bug fixes and better support for situations like link time optimization (LTO). * Usage of syntax extensions when cross-compiling has been fixed. * Functionality equivalent to GCC & Clang's -ffunction-sections, -fdata-sections and --gc-sections has been enabled by default * The compiler is now stricter about where it will load module files from when a module is declared via `mod foo;`. * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)]. Syntax extensions are now discovered via a "plugin registrar" type which will be extended in the future to other various plugins. * Lints have been restructured to allow for dynamically loadable lints. * A number of rustdoc improvements: * The HTML output has been visually redesigned. * Markdown is now powered by hoedown instead of sundown. * Searching heuristics have been greatly improved. * The search index has been reduced in size by a great amount. * Cross-crate documentation via `pub use` has been greatly improved. * Primitive types are now hyperlinked and documented. * Documentation has been moved from static.rust-lang.org/doc to doc.rust-lang.org * A new sandbox, play.rust-lang.org, is available for running and sharing rust code examples on-line. * Unused attributes are now more robustly warned about. * The dead_code lint now warns about unused struct fields. * Cross-compiling to iOS is now supported. * Cross-compiling to mipsel is now supported. * Stability attributes are now inherited by default and no longer apply to intra-crate usage, only inter-crate usage. * Error message related to non-exhaustive match expressions have been greatly improved. Version 0.10 (2014-04-03) ========================= * ~1500 changes, numerous bugfixes * Language * A new RFC process is now in place for modifying the language. * Patterns with `@`-pointers have been removed from the language. * Patterns with unique vectors (`~[T]`) have been removed from the language. * Patterns with unique strings (`~str`) have been removed from the language. * `@str` has been removed from the language. * `@[T]` has been removed from the language. * `@self` has been removed from the language. * `@Trait` has been removed from the language. * Headers on `~` allocations which contain `@` boxes inside the type for reference counting have been removed. * The semantics around the lifetimes of temporary expressions have changed, see #3511 and #11585 for more information. * Cross-crate syntax extensions are now possible, but feature gated. See #11151 for more information. This includes both `macro_rules!` macros as well as syntax extensions such as `format!`. * New lint modes have been added, and older ones have been turned on to be warn-by-default. * Unnecessary parentheses * Uppercase statics * Camel Case types * Uppercase variables * Publicly visible private types * `#[deriving]` with raw pointers * Unsafe functions can no longer be coerced to closures. * Various obscure macros such as `log_syntax!` are now behind feature gates. * The `#[simd]` attribute is now behind a feature gate. * Visibility is no longer allowed on `extern crate` statements, and unnecessary visibility (`priv`) is no longer allowed on `use` statements. * Trailing commas are now allowed in argument lists and tuple patterns. * The `do` keyword has been removed, it is now a reserved keyword. * Default type parameters have been implemented, but are feature gated. * Borrowed variables through captures in closures are now considered soundly. * `extern mod` is now `extern crate` * The `Freeze` trait has been removed. * The `Share` trait has been added for types that can be shared among threads. * Labels in macros are now hygienic. * Expression/statement macro invocations can be delimited with `{}` now. * Treatment of types allowed in `static mut` locations has been tweaked. * The `*` and `.` operators are now overloadable through the `Deref` and `DerefMut` traits. * `~Trait` and `proc` no longer have `Send` bounds by default. * Partial type hints are now supported with the `_` type marker. * An `Unsafe` type was introduced for interior mutability. It is now considered undefined to transmute from `&T` to `&mut T` without using the `Unsafe` type. * The #[linkage] attribute was implemented for extern statics/functions. * The inner attribute syntax has changed from `#[foo];` to `#![foo]`. * `Pod` was renamed to `Copy`. * Libraries * The `libextra` library has been removed. It has now been decomposed into component libraries with smaller and more focused nuggets of functionality. The full list of libraries can be found on the documentation index page. * std: `std::condition` has been removed. All I/O errors are now propagated through the `Result` type. In order to assist with error handling, a `try!` macro for unwrapping errors with an early return and a lint for unused results has been added. See #12039 for more information. * std: The `vec` module has been renamed to `slice`. * std: A new vector type, `Vec`, has been added in preparation for DST. This will become the only growable vector in the future. * std: `std::io` now has more public re-exports. Types such as `BufferedReader` are now found at `std::io::BufferedReader` instead of `std::io::buffered::BufferedReader`. * std: `print` and `println` are no longer in the prelude, the `print!` and `println!` macros are intended to be used instead. * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer attempts to statically prevent cycles. * std: The standard distribution is adopting the policy of pushing failure to the user rather than failing in libraries. Many functions (such as `slice::last()`) now return `Option` instead of `T` + failing. * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new deriving mode: `#[deriving(Show)]`. * std: `ToStr` is now implemented for all types implementing `Show`. * std: The formatting trait methods now take `&self` instead of `&T` * std: The `invert()` method on iterators has been renamed to `rev()` * std: `std::num` has seen a reduction in the genericity of its traits, consolidating functionality into a few core traits. * std: Backtraces are now printed on task failure if the environment variable `RUST_BACKTRACE` is present. * std: Naming conventions for iterators have been standardized. More details can be found on the wiki's style guide. * std: `eof()` has been removed from the `Reader` trait. Specific types may still implement the function. * std: Networking types are now cloneable to allow simultaneous reads/writes. * std: `assert_approx_eq!` has been removed * std: The `e` and `E` formatting specifiers for floats have been added to print them in exponential notation. * std: The `Times` trait has been removed * std: Indications of variance and opting out of builtin bounds is done through marker types in `std::kinds::marker` now * std: `hash` has been rewritten, `IterBytes` has been removed, and `#[deriving(Hash)]` is now possible. * std: `SharedChan` has been removed, `Sender` is now cloneable. * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`. * std: `Chan::new` is now `channel()`. * std: A new synchronous channel type has been implemented. * std: A `select!` macro is now provided for selecting over `Receiver`s. * std: `hashmap` and `trie` have been moved to `libcollections` * std: `run` has been rolled into `io::process` * std: `assert_eq!` now uses `{}` instead of `{:?}` * std: The equality and comparison traits have seen some reorganization. * std: `rand` has moved to `librand`. * std: `to_{lower,upper}case` has been implemented for `char`. * std: Logging has been moved to `liblog`. * collections: `HashMap` has been rewritten for higher performance and less memory usage. * native: The default runtime is now `libnative`. If `libgreen` is desired, it can be booted manually. The runtime guide has more information and examples. * native: All I/O functionality except signals has been implemented. * green: Task spawning with `libgreen` has been optimized with stack caching and various trimming of code. * green: Tasks spawned by `libgreen` now have an unmapped guard page. * sync: The `extra::sync` module has been updated to modern rust (and moved to the `sync` library), tweaking and improving various interfaces while dropping redundant functionality. * sync: A new `Barrier` type has been added to the `sync` library. * sync: An efficient mutex for native and green tasks has been implemented. * serialize: The `base64` module has seen some improvement. It treats newlines better, has non-string error values, and has seen general cleanup. * fourcc: A `fourcc!` macro was introduced * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a hexadecimal literal. * Tooling * `rustpkg` has been deprecated and removed from the main repository. Its replacement, `cargo`, is under development. * Nightly builds of rust are now available * The memory usage of rustc has been improved many times throughout this release cycle. * The build process supports disabling rpath support for the rustc binary itself. * Code generation has improved in some cases, giving more information to the LLVM optimization passes to enable more extensive optimizations. * Debuginfo compatibility with lldb on OSX has been restored. * The master branch is now gated on an android bot, making building for android much more reliable. * Output flags have been centralized into one `--emit` flag. * Crate type flags have been centralized into one `--crate-type` flag. * Codegen flags have been consolidated behind a `-C` flag. * Linking against outdated crates now has improved error messages. * Error messages with lifetimes will often suggest how to annotate the function to fix the error. * Many more types are documented in the standard library, and new guides were written. * Many `rustdoc` improvements: * code blocks are syntax highlighted. * render standalone markdown files. * the --test flag tests all code blocks by default. * exported macros are displayed. * re-exported types have their documentation inlined at the location of the first re-export. * search works across crates that have been rendered to the same output directory. Version 0.9 (2014-01-09) ========================== * ~1800 changes, numerous bugfixes * Language * The `float` type has been removed. Use `f32` or `f64` instead. * A new facility for enabling experimental features (feature gating) has been added, using the crate-level `#[feature(foo)]` attribute. * Managed boxes (@) are now behind a feature gate (`#[feature(managed_boxes)]`) in preparation for future removal. Use the standard library's `Gc` or `Rc` types instead. * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead. * Jumping back to the top of a loop is now done with `continue` instead of `loop`. * Strings can no longer be mutated through index assignment. * Raw strings can be created via the basic `r"foo"` syntax or with matched hash delimiters, as in `r###"foo"###`. * `~fn` is now written `proc (args) -> retval { ... }` and may only be called once. * The `&fn` type is now written `|args| -> ret` to match the literal form. * `@fn`s have been removed. * `do` only works with procs in order to make it obvious what the cost of `do` is. * Single-element tuple-like structs can no longer be dereferenced to obtain the inner value. A more comprehensive solution for overloading the dereference operator will be provided in the future. * The `#[link(...)]` attribute has been replaced with `#[crate_id = "name#vers"]`. * Empty `impl`s must be terminated with empty braces and may not be terminated with a semicolon. * Keywords are no longer allowed as lifetime names; the `self` lifetime no longer has any special meaning. * The old `fmt!` string formatting macro has been removed. * `printf!` and `printfln!` (old-style formatting) removed in favor of `print!` and `println!`. * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`. * The `extern mod foo (name = "bar")` syntax has been removed. Use `extern mod foo = "bar"` instead. * New reserved keywords: `alignof`, `offsetof`, `sizeof`. * Macros can have attributes. * Macros can expand to items with attributes. * Macros can expand to multiple items. * The `asm!` macro is feature-gated (`#[feature(asm)]`). * Comments may be nested. * Values automatically coerce to trait objects they implement, without an explicit `as`. * Enum discriminants are no longer an entire word but as small as needed to contain all the variants. The `repr` attribute can be used to override the discriminant size, as in `#[repr(int)]` for integer-sized, and `#[repr(C)]` to match C enums. * Non-string literals are not allowed in attributes (they never worked). * The FFI now supports variadic functions. * Octal numeric literals, as in `0o7777`. * The `concat!` syntax extension performs compile-time string concatenation. * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been removed as Rust no longer uses segmented stacks. * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`). * Ignoring all fields of an enum variant or tuple-struct is done with `..`, not `*`; ignoring remaining fields of a struct is also done with `..`, not `_`; ignoring a slice of a vector is done with `..`, not `.._`. * `rustc` supports the "win64" calling convention via `extern "win64"`. * `rustc` supports the "system" calling convention, which defaults to the preferred convention for the target platform, "stdcall" on 32-bit Windows, "C" elsewhere. * The `type_overflow` lint (default: warn) checks literals for overflow. * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`. * The `attribute_usage` lint (default: warn) warns about unknown attributes. * The `unknown_features` lint (default: warn) warns about unknown feature gates. * The `dead_code` lint (default: warn) checks for dead code. * Rust libraries can be linked statically to one another * `#[link_args]` is behind the `link_args` feature gate. * Native libraries are now linked with `#[link(name = "foo")]` * Native libraries can be statically linked to a rust crate (`#[link(name = "foo", kind = "static")]`). * Native OS X frameworks are now officially supported (`#[link(name = "foo", kind = "framework")]`). * The `#[thread_local]` attribute creates thread-local (not task-local) variables. Currently behind the `thread_local` feature gate. * The `return` keyword may be used in closures. * Types that can be copied via a memcpy implement the `Pod` kind. * The `cfg` attribute can now be used on struct fields and enum variants. * Libraries * std: The `option` and `result` API's have been overhauled to make them simpler, more consistent, and more composable. * std: The entire `std::io` module has been replaced with one that is more comprehensive and that properly interfaces with the underlying scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all implemented. * std: `io::util` contains a number of useful implementations of `Reader` and `Writer`, including `NullReader`, `NullWriter`, `ZeroReader`, `TeeReader`. * std: The reference counted pointer type `extra::rc` moved into std. * std: The `Gc` type in the `gc` module will replace `@` (it is currently just a wrapper around it). * std: The `Either` type has been removed. * std: `fmt::Default` can be implemented for any type to provide default formatting to the `format!` macro, as in `format!("{}", myfoo)`. * std: The `rand` API continues to be tweaked. * std: The `rust_begin_unwind` function, useful for inserting breakpoints on failure in gdb, is now named `rust_fail`. * std: The `each_key` and `each_value` methods on `HashMap` have been replaced by the `keys` and `values` iterators. * std: Functions dealing with type size and alignment have moved from the `sys` module to the `mem` module. * std: The `path` module was written and API changed. * std: `str::from_utf8` has been changed to cast instead of allocate. * std: `starts_with` and `ends_with` methods added to vectors via the `ImmutableEqVector` trait, which is in the prelude. * std: Vectors can be indexed with the `get_opt` method, which returns `None` if the index is out of bounds. * std: Task failure no longer propagates between tasks, as the model was complex, expensive, and incompatible with thread-based tasks. * std: The `Any` type can be used for dynamic typing. * std: `~Any` can be passed to the `fail!` macro and retrieved via `task::try`. * std: Methods that produce iterators generally do not have an `_iter` suffix now. * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability roots (mutable fields, etc.). Use instead of e.g. `@mut`. * std: `util::ignore` renamed to `prelude::drop`. * std: Slices have `sort` and `sort_by` methods via the `MutableVector` trait. * std: `vec::raw` has seen a lot of cleanup and API changes. * std: The standard library no longer includes any C++ code, and very minimal C, eliminating the dependency on libstdc++. * std: Runtime scheduling and I/O functionality has been factored out into extensible interfaces and is now implemented by two different crates: libnative, for native threading and I/O; and libgreen, for green threading and I/O. This paves the way for using the standard library in more limited embedded environments. * std: The `comm` module has been rewritten to be much faster, have a simpler, more consistent API, and to work for both native and green threading. * std: All libuv dependencies have been moved into the rustuv crate. * native: New implementations of runtime scheduling on top of OS threads. * native: New native implementations of TCP, UDP, file I/O, process spawning, and other I/O. * green: The green thread scheduler and message passing types are almost entirely lock-free. * extra: The `flatpipes` module had bitrotted and was removed. * extra: All crypto functions have been removed and Rust now has a policy of not reimplementing crypto in the standard library. In the future crypto will be provided by external crates with bindings to established libraries. * extra: `c_vec` has been modernized. * extra: The `sort` module has been removed. Use the `sort` method on mutable slices. * Tooling * The `rust` and `rusti` commands have been removed, due to lack of maintenance. * `rustdoc` was completely rewritten. * `rustdoc` can test code examples in documentation. * `rustpkg` can test packages with the argument, 'test'. * `rustpkg` supports arbitrary dependencies, including C libraries. * `rustc`'s support for generating debug info is improved again. * `rustc` has better error reporting for unbalanced delimiters. * `rustc`'s JIT support was removed due to bitrot. * Executables and static libraries can be built with LTO (-Z lto) * `rustc` adds a `--dep-info` flag for communicating dependencies to build tools. Version 0.8 (2013-09-26) ============================ * ~2200 changes, numerous bugfixes * Language * The `for` loop syntax has changed to work with the `Iterator` trait. * At long last, unwinding works on Windows. * Default methods are ready for use. * Many trait inheritance bugs fixed. * Owned and borrowed trait objects work more reliably. * `copy` is no longer a keyword. It has been replaced by the `Clone` trait. * rustc can omit emission of code for the `debug!` macro if it is passed `--cfg ndebug` * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look for foo.rs, then foo/mod.rs, and will generate an error when both are present. * Strings no longer contain trailing nulls. The new `std::c_str` module provides new mechanisms for converting to C strings. * The type of foreign functions is now `extern "C" fn` instead of `*u8'. * The FFI has been overhauled such that foreign functions are called directly, instead of through a stack-switching wrapper. * Calling a foreign function must be done through a Rust function with the `#[fixed_stack_segment]` attribute. * The `externfn!` macro can be used to declare both a foreign function and a `#[fixed_stack_segment]` wrapper at once. * `pub` and `priv` modifiers on `extern` blocks are no longer parsed. * `unsafe` is no longer allowed on extern fns - they are all unsafe. * `priv` is disallowed everywhere except for struct fields and enum variants. * `&T` (besides `&'static T`) is no longer allowed in `@T`. * `ref` bindings in irrefutable patterns work correctly now. * `char` is now prevented from containing invalid code points. * Casting to `bool` is no longer allowed. * `\0` is now accepted as an escape in chars and strings. * `yield` is a reserved keyword. * `typeof` is a reserved keyword. * Crates may be imported by URL with `extern mod foo = "url";`. * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }` * Static vectors can be initialized with repeating elements, e.g. `static foo: [u8, .. 100]: [0, .. 100];`. * Static structs can be initialized with functional record update, e.g. `static foo: Foo = Foo { a: 5, .. bar };`. * `cfg!` can be used to conditionally execute code based on the crate configuration, similarly to `#[cfg(...)]`. * The `unnecessary_qualification` lint detects unneeded module prefixes (default: allow). * Arithmetic operations have been implemented on the SIMD types in `std::unstable::simd`. * Exchange allocation headers were removed, reducing memory usage. * `format!` implements a completely new, extensible, and higher-performance string formatting system. It will replace `fmt!`. * `print!` and `println!` write formatted strings (using the `format!` extension) to stdout. * `write!` and `writeln!` write formatted strings (using the `format!` extension) to the new Writers in `std::rt::io`. * The library section in which a function or static is placed may be specified with `#[link_section = "..."]`. * The `proto!` syntax extension for defining bounded message protocols was removed. * `macro_rules!` is hygienic for `let` declarations. * The `#[export_name]` attribute specifies the name of a symbol. * `unreachable!` can be used to indicate unreachable code, and fails if executed. * Libraries * std: Transitioned to the new runtime, written in Rust. * std: Added an experimental I/O library, `rt::io`, based on the new runtime. * std: A new generic `range` function was added to the prelude, replacing `uint::range` and friends. * std: `range_rev` no longer exists. Since range is an iterator it can be reversed with `range(lo, hi).invert()`. * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default` renamed to `unwrap_or`. * std: The `iterator` module was renamed to `iter`. * std: Integral types now support the `checked_add`, `checked_sub`, and `checked_mul` operations for detecting overflow. * std: Many methods in `str`, `vec`, `option, `result` were renamed for consistency. * std: Methods are standardizing on conventions for casting methods: `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary and cheap casts. * std: The `CString` type in `c_str` provides new ways to convert to and from C strings. * std: `DoubleEndedIterator` can yield elements in two directions. * std: The `mut_split` method on vectors partitions an `&mut [T]` into two splices. * std: `str::from_bytes` renamed to `str::from_utf8`. * std: `pop_opt` and `shift_opt` methods added to vectors. * std: The task-local data interface no longer uses @, and keys are no longer function pointers. * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`. * std: Added `SharedPort` to `comm`. * std: `Eq` has a default method for `ne`; only `eq` is required in implementations. * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt` is required in implementations. * std: `is_utf8` performance is improved, impacting many string functions. * std: `os::MemoryMap` provides cross-platform mmap. * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that are not 'in-bounds' are considered undefined. * std: Many freestanding functions in `vec` removed in favor of methods. * std: Many freestanding functions on scalar types removed in favor of methods. * std: Many options to task builders were removed since they don't make sense in the new scheduler design. * std: More containers implement `FromIterator` so can be created by the `collect` method. * std: More complete atomic types in `unstable::atomics`. * std: `comm::PortSet` removed. * std: Mutating methods in the `Set` and `Map` traits have been moved into the `MutableSet` and `MutableMap` traits. `Container::is_empty`, `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have default implementations. * std: Various `from_str` functions were removed in favor of a generic `from_str` which is available in the prelude. * std: `util::unreachable` removed in favor of the `unreachable!` macro. * extra: `dlist`, the doubly-linked list was modernized. * extra: Added a `hex` module with `ToHex` and `FromHex` traits. * extra: Added `glob` module, replacing `std::os::glob`. * extra: `rope` was removed. * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`. * extra: `net`, and `timer` were removed. The experimental replacements are `std::rt::io::net` and `std::rt::io::timer`. * extra: Iterators implemented for `SmallIntMap`. * extra: Iterators implemented for `Bitv` and `BitvSet`. * extra: `SmallIntSet` removed. Use `BitvSet`. * extra: Performance of JSON parsing greatly improved. * extra: `semver` updated to SemVer 2.0.0. * extra: `term` handles more terminals correctly. * extra: `dbg` module removed. * extra: `par` module removed. * extra: `future` was cleaned up, with some method renames. * extra: Most free functions in `getopts` were converted to methods. * Other * rustc's debug info generation (`-Z debug-info`) is greatly improved. * rustc accepts `--target-cpu` to compile to a specific CPU architecture, similarly to gcc's `--march` flag. * rustc's performance compiling small crates is much better. * rustpkg has received many improvements. * rustpkg supports git tags as package IDs. * rustpkg builds into target-specific directories so it can be used for cross-compiling. * The number of concurrent test tasks is controlled by the environment variable RUST_TEST_TASKS. * The test harness can now report metrics for benchmarks. * All tools have man pages. * Programs compiled with `--test` now support the `-h` and `--help` flags. * The runtime uses jemalloc for allocations. * Segmented stacks are temporarily disabled as part of the transition to the new runtime. Stack overflows are possible! * A new documentation backend, rustdoc_ng, is available for use. It is still invoked through the normal `rustdoc` command. Version 0.7 (2013-07-03) ======================= * ~2000 changes, numerous bugfixes * Language * `impl`s no longer accept a visibility qualifier. Put them on methods instead. * The borrow checker has been rewritten with flow-sensitivity, fixing many bugs and inconveniences. * The `self` parameter no longer implicitly means `&'self self`, and can be explicitly marked with a lifetime. * Overloadable compound operators (`+=`, etc.) have been temporarily removed due to bugs. * The `for` loop protocol now requires `for`-iterators to return `bool` so they compose better. * The `Durable` trait is replaced with the `'static` bounds. * Trait default methods work more often. * Structs with the `#[packed]` attribute have byte alignment and no padding between fields. * Type parameters bound by `Copy` must now be copied explicitly with the `copy` keyword. * It is now illegal to move out of a dereferenced unsafe pointer. * `Option<~T>` is now represented as a nullable pointer. * `@mut` does dynamic borrow checks correctly. * The `main` function is only detected at the topmost level of the crate. The `#[main]` attribute is still valid anywhere. * Struct fields may no longer be mutable. Use inherited mutability. * The `#[no_send]` attribute makes a type that would otherwise be `Send`, not. * The `#[no_freeze]` attribute makes a type that would otherwise be `Freeze`, not. * Unbounded recursion will abort the process after reaching the limit specified by the `RUST_MAX_STACK` environment variable (default: 1GB). * The `vecs_implicitly_copyable` lint mode has been removed. Vectors are never implicitly copyable. * `#[static_assert]` makes compile-time assertions about static bools. * At long last, 'argument modes' no longer exist. * The rarely used `use mod` statement no longer exists. * Syntax extensions * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style argument list. * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`, `Rand`, `Zero` and `ToStr` can all be automatically derived with `#[deriving(...)]`. * The `bytes!` macro returns a vector of bytes for string, u8, char, and unsuffixed integer literals. * Libraries * The `core` crate was renamed to `std`. * The `std` crate was renamed to `extra`. * More and improved documentation. * std: `iterator` module for external iterator objects. * Many old-style (internal, higher-order function) iterators replaced by implementations of `Iterator`. * std: Many old internal vector and string iterators, incl. `any`, `all`. removed. * std: The `finalize` method of `Drop` renamed to `drop`. * std: The `drop` method now takes `&mut self` instead of `&self`. * std: The prelude no longer re-exports any modules, only types and traits. * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`, `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits. * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`, `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`. * std: Tuple traits and accessors defined for up to 12-tuples, e.g. `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`. * std: Many types implement `Clone`. * std: `path` type renamed to `Path`. * std: `mut` module and `Mut` type removed. * std: Many standalone functions removed in favor of methods and iterators in `vec`, `str`. In the future methods will also work as functions. * std: `reinterpret_cast` removed. Use `transmute`. * std: ascii string handling in `std::ascii`. * std: `Rand` is implemented for ~/@. * std: `run` module for spawning processes overhauled. * std: Various atomic types added to `unstable::atomic`. * std: Various types implement `Zero`. * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`. * std: Borrowed pointer functions moved from `ptr` to `borrow`. * std: Added `os::mkdir_recursive`. * std: Added `os::glob` function performs filesystems globs. * std: `FuzzyEq` renamed to `ApproxEq`. * std: `Map` now defines `pop` and `swap` methods. * std: `Cell` constructors converted to static methods. * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`. * extra: `flate` module moved from `std` to `extra`. * extra: `fileinput` module for iterating over a series of files. * extra: `Complex` number type and `complex` module. * extra: `Rational` number type and `rational` module. * extra: `BigInt`, `BigUint` implement numeric and comparison traits. * extra: `term` uses terminfo now, is more correct. * extra: `arc` functions converted to methods. * extra: Implementation of fixed output size variations of SHA-2. * Tooling * `unused_variables` lint mode for unused variables (default: warn). * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks (default: warn). * `unused_mut` lint mode for identifying unused `mut` qualifiers (default: warn). * `dead_assignment` lint mode for unread variables (default: warn). * `unnecessary_allocation` lint mode detects some heap allocations that are immediately borrowed so could be written without allocating (default: warn). * `missing_doc` lint mode (default: allow). * `unreachable_code` lint mode (default: warn). * The `rusti` command has been rewritten and a number of bugs addressed. * rustc outputs in color on more terminals. * rustc accepts a `--link-args` flag to pass arguments to the linker. * rustc accepts a `-Z print-link-args` flag for debugging linkage. * Compiling with `-g` will make the binary record information about dynamic borrowcheck failures for debugging. * rustdoc has a nicer stylesheet. * Various improvements to rustdoc. * Improvements to rustpkg (see the detailed release notes). Version 0.6 (2013-04-03) ======================== * ~2100 changes, numerous bugfixes * Syntax changes * The self type parameter in traits is now spelled `Self` * The `self` parameter in trait and impl methods must now be explicitly named (for example: `fn f(&self) { }`). Implicit self is deprecated. * Static methods no longer require the `static` keyword and instead are distinguished by the lack of a `self` parameter * Replaced the `Durable` trait with the `'static` lifetime * The old closure type syntax with the trailing sigil has been removed in favor of the more consistent leading sigil * `super` is a keyword, and may be prefixed to paths * Trait bounds are separated with `+` instead of whitespace * Traits are implemented with `impl Trait for Type` instead of `impl Type: Trait` * Lifetime syntax is now `&'l foo` instead of `&l/foo` * The `export` keyword has finally been removed * The `move` keyword has been removed (see "Semantic changes") * The interior mutability qualifier on vectors, `[mut T]`, has been removed. Use `&mut [T]`, etc. * `mut` is no longer valid in `~mut T`. Use inherited mutability * `fail` is no longer a keyword. Use `fail!()` * `assert` is no longer a keyword. Use `assert!()` * `log` is no longer a keyword. use `debug!`, etc. * 1-tuples may be represented as `(T,)` * Struct fields may no longer be `mut`. Use inherited mutability, `@mut T`, `core::mut` or `core::cell` * `extern mod { ... }` is no longer valid syntax for foreign function modules. Use extern blocks: `extern { ... }` * Newtype enums removed. Use tuple-structs. * Trait implementations no longer support visibility modifiers * Pattern matching over vectors improved and expanded * `const` renamed to `static` to correspond to lifetime name, and make room for future `static mut` unsafe mutable globals. * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc. * `Clone` implementations can be automatically generated with `#[deriving(Clone)]` * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar` instead of `foo as Bar`. * Fixed length vector types are now written as `[int, .. 3]` instead of `[int * 3]`. * Fixed length vector types can express the length as a constant expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`) * Semantic changes * Types with owned pointers or custom destructors move by default, eliminating the `move` keyword * All foreign functions are considered unsafe * &mut is now unaliasable * Writes to borrowed @mut pointers are prevented dynamically * () has size 0 * The name of the main function can be customized using #[main] * The default type of an inferred closure is &fn instead of @fn * `use` statements may no longer be "chained" - they cannot import identifiers imported by previous `use` statements * `use` statements are crate relative, importing from the "top" of the crate by default. Paths may be prefixed with `super::` or `self::` to change the search behavior. * Method visibility is inherited from the implementation declaration * Structural records have been removed * Many more types can be used in static items, including enums 'static-lifetime pointers and vectors * Pattern matching over vectors improved and expanded * Typechecking of closure types has been overhauled to improve inference and eliminate unsoundness * Macros leave scope at the end of modules, unless that module is tagged with #[macro_escape] * Libraries * Added big integers to `std::bigint` * Removed `core::oldcomm` module * Added pipe-based `core::comm` module * Numeric traits have been reorganized under `core::num` * `vec::slice` finally returns a slice * `debug!` and friends don't require a format string, e.g. `debug!(Foo)` * Containers reorganized around traits in `core::container` * `core::dvec` removed, `~[T]` is a drop-in replacement * `core::send_map` renamed to `core::hashmap` * `std::map` removed; replaced with `core::hashmap` * `std::treemap` reimplemented as an owned balanced tree * `std::deque` and `std::smallintmap` reimplemented as owned containers * `core::trie` added as a fast ordered map for integer keys * Set types added to `core::hashmap`, `core::trie` and `std::treemap` * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to overload the comparison operators, whereas `TotalOrd` is used by certain container types * Other * Replaced the 'cargo' package manager with 'rustpkg' * Added all-purpose 'rust' tool * `rustc --test` now supports benchmarks with the `#[bench]` attribute * rustc now *attempts* to offer spelling suggestions * Improved support for ARM and Android * Preliminary MIPS backend * Improved foreign function ABI implementation for x86, x86_64 * Various memory usage improvements * Rust code may be embedded in foreign code under limited circumstances * Inline assembler supported by new asm!() syntax extension. Version 0.5 (2012-12-21) =========================== * ~900 changes, numerous bugfixes * Syntax changes * Removed `<-` move operator * Completed the transition from the `#fmt` extension syntax to `fmt!` * Removed old fixed length vector syntax - `[T]/N` * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc. * Macros may now expand to items and statements * `a.b()` is always parsed as a method call, never as a field projection * `Eq` and `IterBytes` implementations can be automatically generated with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively * Removed the special crate language for `.rc` files * Function arguments may consist of any irrefutable pattern * Semantic changes * `&` and `~` pointers may point to objects * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums. * Enum variants may be structs * Destructors can be added to all nominal types with the Drop trait * Structs and nullary enum variants may be constants * Values that cannot be implicitly copied are now automatically moved without writing `move` explicitly * `&T` may now be coerced to `*T` * Coercions happen in `let` statements as well as function calls * `use` statements now take crate-relative paths * The module and type namespaces have been merged so that static method names can be resolved under the trait in which they are declared * Improved support for language features * Trait inheritance works in many scenarios * More support for explicit self arguments in methods - `self`, `&self` `@self`, and `~self` all generally work as expected * Static methods work in more situations * Experimental: Traits may declare default methods for the implementations to use * Libraries * New condition handling system in `core::condition` * Timsort added to `std::sort` * New priority queue, `std::priority_queue` * Pipes for serializable types, `std::flatpipes' * Serialization overhauled to be trait-based * Expanded `getopts` definitions * Moved futures to `std` * More functions are pure now * `core::comm` renamed to `oldcomm`. Still deprecated * `rustdoc` and `cargo` are libraries now * Misc * Added a preliminary REPL, `rusti` * License changed from MIT to dual MIT/APL2 Version 0.4 (2012-10-15) ========================== * ~2000 changes, numerous bugfixes * Syntax * All keywords are now strict and may not be used as identifiers anywhere * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send', 'of', 'with', 'to', 'class'. * Classes are replaced with simpler structs * Explicit method self types * `ret` became `return` and `alt` became `match` * `import` is now `use`; `use is now `extern mod` * `extern mod { ... }` is now `extern { ... }` * `use mod` is the recommended way to import modules * `pub` and `priv` replace deprecated export lists * The syntax of `match` pattern arms now uses fat arrow (=>) * `main` no longer accepts an args vector; use `os::args` instead * Semantics * Trait implementations are now coherent, ala Haskell typeclasses * Trait methods may be static * Argument modes are deprecated * Borrowed pointers are much more mature and recommended for use * Strings and vectors in the static region are stored in constant memory * Typestate was removed * Resolution rewritten to be more reliable * Support for 'dual-mode' data structures (freezing and thawing) * Libraries * Most binary operators can now be overloaded via the traits in `core::ops' * `std::net::url` for representing URLs * Sendable hash maps in `core::send_map` * `core::task' gained a (currently unsafe) task-local storage API * Concurrency * An efficient new intertask communication primitive called the pipe, along with a number of higher-level channel types, in `core::pipes` * `std::arc`, an atomically reference counted, immutable, shared memory type * `std::sync`, various exotic synchronization tools based on arcs and pipes * Futures are now based on pipes and sendable * More robust linked task failure * Improved task builder API * Other * Improved error reporting * Preliminary JIT support * Preliminary work on precise GC * Extensive architectural improvements to rustc * Begun a transition away from buggy C++-based reflection (shape) code to Rust-based (visitor) code * All hash functions and tables converted to secure, randomized SipHash Version 0.3 (2012-07-12) ======================== * ~1900 changes, numerous bugfixes * New coding conveniences * Integer-literal suffix inference * Per-item control over warnings, errors * #[cfg(windows)] and #[cfg(unix)] attributes * Documentation comments * More compact closure syntax * 'do' expressions for treating higher-order functions as control structures * *-patterns (wildcard extended to all constructor fields) * Semantic cleanup * Name resolution pass and exhaustiveness checker rewritten * Region pointers and borrow checking supersede alias analysis * Init-ness checking is now provided by a region-based liveness pass instead of the typestate pass; same for last-use analysis * Extensive work on region pointers * Experimental new language features * Slices and fixed-size, interior-allocated vectors * #!-comments for lang versioning, shell execution * Destructors and iface implementation for classes; type-parameterized classes and class methods * 'const' type kind for types that can be used to implement shared-memory concurrency patterns * Type reflection * Removal of various obsolete features * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind', 'crust', 'native' (now 'extern'), 'cont' (now 'again') * Constructs: do-while loops ('do' repurposed), fn binding, resources (replaced by destructors) * Compiler reorganization * Syntax-layer of compiler split into separate crate * Clang (from LLVM project) integrated into build * Typechecker split into sub-modules * New library code * New time functions * Extension methods for many built-in types * Arc: atomic-refcount read-only / exclusive-use shared cells * Par: parallel map and search routines * Extensive work on libuv interface * Much vector code moved to libraries * Syntax extensions: #line, #col, #file, #mod, #stringify, #include, #include_str, #include_bin * Tool improvements * Cargo automatically resolves dependencies Version 0.2 (2012-03-29) ========================= * >1500 changes, numerous bugfixes * New docs and doc tooling * New port: FreeBSD x86_64 * Compilation model enhancements * Generics now specialized, multiply instantiated * Functions now inlined across separate crates * Scheduling, stack and threading fixes * Noticeably improved message-passing performance * Explicit schedulers * Callbacks from C * Helgrind clean * Experimental new language features * Operator overloading * Region pointers * Classes * Various language extensions * C-callback function types: 'crust fn ...' * Infinite-loop construct: 'loop { ... }' * Shorten 'mutable' to 'mut' * Required mutable-local qualifier: 'let mut ...' * Basic glob-exporting: 'export foo::*;' * Alt now exhaustive, 'alt check' for runtime-checked * Block-function form of 'for' loop, with 'break' and 'ret'. * New library code * AST quasi-quote syntax extension * Revived libuv interface * New modules: core::{future, iter}, std::arena * Merged per-platform std::{os*, fs*} to core::{libc, os} * Extensive cleanup, regularization in libstd, libcore Version 0.1 (2012-01-20) =============================== * Most language features work, including: * Unique pointers, unique closures, move semantics * Interface-constrained generics * Static interface dispatch * Stack growth * Multithread task scheduling * Typestate predicates * Failure unwinding, destructors * Pattern matching and destructuring assignment * Lightweight block-lambda syntax * Preliminary macro-by-example * Compiler works with the following configurations: * Linux: x86 and x86_64 hosts and targets * macOS: x86 and x86_64 hosts and targets * Windows: x86 hosts and targets * Cross compilation / multi-target configuration supported. * Preliminary API-documentation and package-management tools included. Known issues: * Documentation is incomplete. * Performance is below intended target. * Standard library APIs are subject to extensive change, reorganization. * Language-level versioning is not yet operational - future code will break unexpectedly.